I´ll try to put together the least difficult way, so that even with a mediocore roll on stats you should be able to do it. But there are some really hard monsters in there, and some can´t be skipped. The numbers are refering to the locations on the map and here i will only mention the ones used for the walkthrough, because i don´t want to spoil the story and places to explore.

After rolling your stats you can bring one potion with you, i used Luck if i got less than 8 and any other time the Stamina restoring one. Skillpotion isn´t that needed if you follow this walkthrough.

000
cross bridge
test of luck, if unlucky another test of luck, if unlucky again, roll one dice for damage

001
fight two wolfes
1. Wolf 7 ST 8 SK
2. Wolf 7 ST 8 SK

002
dig a shelter
loose some provisions

003
enter the hut
warm up -> + 3 Stamina
leave hut
take weapons -> + War-Hammer; + Spear
(taking the weapons is optional, but makes the fight with the Yeti easier)

004
use spear
roll a die
-> if it´s a 1 - didn´t get that, but i think it will instantly die nope the spear falls down
-> anything else - wounded the Yeti, fight it 9 ST 10 SK
(if you didn´t bring the spear the Yeti will have 12 ST 11 SK)

005
test of luck, if unlucky test of skill, if didn´t pass another test of luck

at the T-junction go right

1
drink -> +3 Stamina

2
say join snow witch
say slay her
+ cloak

4
go inside
attack - you´ll have to fight neanderthal 8 ST 7 SK
search the cupboards
- blow flute
- read runes
- read book -> - 4 Stamina; open book, put it on
- smell rose -> + 3 Stamina

5
Test of Luck (cause you are wearing a cloak), if lucky go on
if unlucky you can test again for the flute, if lucky go on
if still unlucky you have to fight Ice Demon 11 ST 9 SK after a Skilltest (i never lost that one)
if you win, you get + 1 Luck

5a
go to where the calls are

31
help the Dwarf
+ 3 iron balls and a sling

6
attack him
strike the one to your right
smash his prism
you get a genie here, but you already have the War-Hammer and won´t be using him
enter the tunnel with the skull

32
attack
you should have a sling
Test of Skill, if you pass it he dies (don´t know what happens if you don´t pass)
if you forgot the sling, you can fight Frost Giant 10 St 10 SK after a successful Test of Luck
try on gold ring -> + 1 Luck
try on copper ring -> + 1 Luck

9
you have to fight because you brought a War-Hammer.
(you can avoid that by not picking up the weapons at 003, then you should be invisible because of the genie)
Crystal Warrior 13 ST 11 SK

10
go right here

33
knock
attack
fight Zombie 6 ST 6 SK
you can pick three things here, you´ll take:
- garlic
- ground Minotaur Horn
- Dragon Eggs

11
use ground Minotaur Horn

12
use garlic
use Rune Stick
Skill is 10 or more - kill the witch ( no idea what happens if less, never had a roll that low, at least none that survied to here)

13
you must fight the sentinel 9 ST 9 SK
yay you can now fill your backpack with coins

At the next t-Junction go left (61)

14
pick up the Orb
keep holding it
+ 3 Stamina
+ 1 Luck

15
roll a die (as long as you don´t roll a 1 or 2 for the first one all is fine)
1 or 2
you look at it - 1 Luck point; - 4 Stamina and - 1 Skill
3 or 4
Dwarf
5 or 6
elf finds hidden boots
roll dice for who will get them
5 or 6
you get the boots (not that good if you want to get to the end easier, but is okay)

16
fight Caveman 8 ST 8 SK
if you defeat him + star shaped metal disc

17
you have brought amulet of courage( at 4 inside book) (don´t know what happens if you don´t have it)
fight Brain Eater 10 ST 10 SK

18
look inside red pot -> square metal disc
look inside grey pot
break seal
Test of Skill, if passed -> you get spell against Air Elemental

19
open Door
if no more Provisions - 2 Stamina
if you have you share them with the others
(if you have some left over, eat them before)

at the next t-junction go left (if you got the words against Air-elemental)

20
take shield
use words (don´t know what happens if you don´t know them, probably you would have to fight it)
+ 1 Skill

21
have a shield -> nothing happens
no shield -> - 4 Stamina and - 1 Luck

22
use sling
Skilltest
if passed, test of Luck
lucky -> avoid damage
unlucky -> don´t know
you have to fight
1. Zombie Dwarf 9 ST 8 SK
2. Zomnie Elf 9 St 9 SK

23
you have metal discs
conceal square
Test of Luck
lucky -> no damage
unlucky -> - 4 Stamina

24
walk on
wait for owner -> + 2 Stamina
drink liquid -> + 1 Skill, + 4 Stamina, + 1 Luck
+ 4 Stamina
(you won´t get more Stamina than your rolled max.)

25
pay him or not doesn´t matter

26
Test of Luck
lucky - no damage
unlucky - 2 Stamina
you have to fight the Birdman 8 ST 12 SK

27
dont drink
- 1 Stamina
+ 1 Stamina

28
Test of Luck
lucky - nothing
unlucky - fight a werewolf 10 ST 8 SK

29
you must fight 2 Hilltrolls
1. Hilltroll 10 ST 9 SK
2. Hilltroll 9 ST 9 SK

30
Test of Luck
lucky - go on
unlucky - fight 2 Hilltrolls
1. Hilltroll 9 ST 8 SK
2. Hilltroll 9 ST 9 SK
+ 1 Skillpoint if you defeat them
if you drank the potion -1 Skill and - 1 Stamina (if not you are dead)

choose to walk over the bridge (385)

34
- 1 Stamina
keep walking

36
Test of Luck
lucky - nothing
unlucky - 4 Stamina

37
climb up
you must fight a Man-Orc 6 ST 8 SK
+ candle and Tinderbox

38
if you wear the elfin boots from 15, then you just go on
if not you have to fight the Barbarian 8 ST 9 SK
if defeated you get + 3 silver arrowheads
wear armband -> + 1 Skill

39
enter cave
roll a die, result will be substracted from Stamina
candle and tinerbox will be used here
Skillcheck
Dragon egg will be used here
Skillcheck (i think if you don´t pass that one, you either fight or die instantly, but i never failed so i don´t know)
silver arrowheads will be used
if you didn´t bring them you will have to fight a Hobgoblin 7 ST 6 SK
and will have to take a test of Luck

40
it is a phoenix
yay you are cured

What, where to find it and for what use:

Spear
003 take weapons outside the hut
needed for the Yeti - makes it easier too kill

War-Hammer
003 take weapons outside the hut
needed for the Crystal warrior

Genie
6 smash the prism
can be used at 9 if you don´t have a warhammer

Gold Ring
32 try it on
can be used at 11

Copper Ring
32 try it on
can be used at 11

Amulet of Courage
4 open Cupboard,take book,open it again, then wear it
needed for the octopus monster

Cloak
2 tell Dark Elf you are here for slaying the witch
optional for the hall of followers - can go unnoticed with luck test

Magic Flute
4 open Cupboard and take it
can be used at 5 and 6

Rune Stick
4 open Cupboard and take it
needed to kill Snow Witch

Iron Ball and Sling
31 help Dwarf
easier to kill Frost Giant, optional for Snow witch head

ground M. Horn
33 take it after defeating zombie
avoid white rat - get an Achievement

Garlic
33 take it after defeating the zombie
needed for Snow witch (optional, you can test your luck)

Box of Teeth
33 take it after defeating zombie
useless?

Jar of pickled tails
33 take it after defeating zombie
useless?

Dragon eggs
33 take it after defeating the Zombie
needed for healing death spell (may be optional)

Words Elemental
18 look into gray pot, open scroll pass test
needed for Air elemental

Potion of health
24 go on, wait for owner, drink it
needed to survive death spell

Candle
37 go up and defeat Orc-Man
needed for healing death spell (may be optional)

Tinder Box
37 go up and Defeat Orc-Man
needed for healing death spell (may be optional)

Elfin Boots
15 roll a 5 or 6 and then roll 5 or 6 again
needed to sneak around Barbarian

silver Arrowheads
38 defeat Barbarian
needed to attrackt pegasus

Star metal disc
16 defeat Caveman
needed for the Disc Game (only needed for achievement)

round metal disc
50 after the footprint section on the ground
can be played in Disc Game (only needed for Achievement)

square metal disc
18 look into red pot
can be played in Disc game (winning one)

Candle
46 defeat the Goblins

Daggers
46/3 defeat the Goblins
can be used at 8 (no daggers there and you die)

Iron Key
47 search ORC Backpack, eat loaf
can be used at 7 to open door

Shield
20 pick it up, but be sure to know the Air elemental spell
can be used at 21 to avoid acid

Turkish Delight
consume 10 Provisions
can be done over more than one walkthrough (i think)

Frost, Snow, Ice
Find all Enemies with these words in their name
Frost Giant (10 St 10 SK) at 32 you can defeat him with a sword or bring a sling
Snow Witch at 12 bring a Runestick
Ice Demon (11 ST 9 SK) at 5 attack the followers
Snow Witch head at 22 bring a sling and win at Disc Game
Snow Wolfes at 001 (7 ST 8 SK and 7 ST 8 SK)

Adventurer Win
Find the ultimate ending in Medium Mode
just follow the Walkthrough - can use Bookmarks to restart after death

Artist
find all the images hidden within Caverns of the Snow Witch
just visit all the spots on the map and try to encounter everyone

Ding! Dong!
the Snow Witch is dead
kill the Snow witch at 12 - you will need a Runestick

Idle Hands
Survive your own murderous hand
at 19 pull out the dagger and win the Test of Luck

Curses
recieve a curse from a stranded Dwarf
at 31 don´t help the Dwarf

Put a Ring on it
try all of the rings
at 32 defeat the Frost Giant and try them all on

Horsefly
fly on a Pegasus
at 39 bring 3 silver Arrows

Let it go
trick two foolish Goblins
at 46 pull on rope and pass Test of Luck

Swept Away
survive beeing swept away by an avalanche
at 5 fail Test of Luck, fail Skill Test and then pass Test of Luck

I´m on a Boat
steal a boat and sail away
at 24 walk on, then just take the boat

Waste of Brain
deny the Brain Slayer of a meal
bring the Amulet from 4 to 17

Duck Season
steal a meal of Duck
at 44 defeat the Sinewy Man 5 ST 6 SK

With Friends like these
slay Zombie replicas of your friends
at 22 defeat the Zombies Dwarf 9 St 8 SK and Zombie Elf 9 St 9 SK

Birthday Cake
even if it´s not your birthday
take the Cake at 4

Bedtime Stories
remember an old legend to your benefit
bring ground Minotaur Horn to 11

Magic Music
be healed by the minstrel´s music
go in and ask about the music at 48

Walk Softly
successfully navigate your way past the Banshee
at 39 bring a Dragon Egg and then pass the Skill Check (can be done without egg)

Excali-BRRR
solve the riddle of the rhyme
at 47 draw out the sword

Discus
find all three metal shapes
go to 50 (automatic pich up), 16 (defeat Caveman 8 St 8 SK) and 18 (inside red pot)

A Winner is You
Beat the Witch at her own Game
at 23 hide the square disc

Sizzling Shower
experience a particularly nasty shower
don´t bring a shield to 21

Nowhere to Hide
hit the true Illusionist on your frist try
at 6 attack and then strike the one to your right

Hammertime
shatter the Crystal warrior into pieces
bring a War-Hammer to 9 and defeat the Crystal Warrior 13 St 11 SK

Speed Reader
read the spell on the scroll before it fades
at 18 Look inside grey pot, break seal and pass Skill Test

Gimme, Gimme, Gimme
take all of the Snow Witch´s treasure
at 13 after the sentinel, have 5 things so you can pack all gold

Only Fools and Horses
convince the Centaurs that you have nothing of value
at 24 give 10 gold to fisherman, and wait for the Centaurs, then talk to them and lie

Hardcore Here Win
Find ultimate ending in Hardcoremode
choose hardcore before starting the game and then roll your stats ( you will be weaker) and then follow the walkthrough (you may want to not pick up the weapons at 003 and try to take down the yeti like this - so you avoid the fight with the crystal warrior) And make lot´s of bookmarks - you´ll need them

Cheater´s Win
Find ultimate ending in free read mode
choose freeread before rolling you stats and then follow the walkthrough

Someone pointed out, that having a screenshot of the artwork would help finding the ones you miss, so here they are: