Complete a run.

Just finish your first run. Not too difficult.

Complete a run while only getting loot upgrades for one of your heroes.

Only upgrade one unit. Do not even level the others up as it currently voids the run. Just in case don't even upgrade the Rook.

Have a Tower deal over 25 damage with a single attack.

I got this with the arcane tower maxed with all my upgrades going into the Rogue. I think they have a tower buff. Also use the hero banner. More than likely you will just get this normally.

Method 2: I don't know why it didn't occur to me before but the sniper tower starts with a base 15 damage. Put two hero banners near it and that's 22. Now you just need some good upgrade trees to get that extra 3 to put you over.

Have 3 Epic Loot upgrades on one hero in a run.

At the moment I do not know how to differentiate loot rarity. I have done 5 All-In runs on my Rogue class and it still never popped for me. This is either heavily RNG dependent or bugged. I'm not sure.

Edit: I can confirm now that it is not bugged. I changed to going all in on my witch and got it on the third run. I'm not sure if some units have more epic upgrades than others or if I just got stupidly lucky. Since I still don't understand the rarity system here's a screenshot of what she had when it popped for me.

Destroy a boss on the first round they appear.

Put all of your usefull upgrades into one unit (I prefer Rogue) and have the INVIGORATE spell. When the first boss comes around go ham and just beat the crystal boi into dust.

Destroy an enemy wave on the first round they arrive.

You will more then likely get this without trying. Just try and position your units evenly across the field to nail them as they appear. Also save your towers till just before the first wave. When the target appears on the ground just position the towers in such a way that they cover what your heroes can't hit. Also the instant damaging magics help.

CREDIT TO Silverika
Not Even Close
Defeat a boss with two of your heroes dead.

"however the latter may be bugged as i did it with 3 heroes dead (hydra with defender) so i'm not sure if it literal or not" -Silverika

I have not personally gotten this yet but I trust their word for it. The problem is I haven't been able to get the achievement for some reason or another. I am wondering if the exact scenario isn't 2 heroes dead but all heroes dead but the sanctuary gets the final hit in to kill the boss. Will test.


ALTERNATE METHOD: CREDIT TO Sly

This is the method I used to get this and may very well be the only method working consistently at this point. For this you need to go all in on one unit, doesn't matter which but I chose Ranger. Then you need to get to the final area. Now this is the important bit, your spare units MUST DIE WAVE 1 OR 2! I have made several attempts where I killed them in wave 4 and it did not count. Just to be safe do it Wave 1. This means your one live unit must survive 5 waves near solo. Make the most of your traps, towers, and spells. For this I used the range spell, the invigorate spell, the lightning spell, the sniper tower, arcane tower, splitter tower, mines, and bomb barrel. Always max out your primary unit and your Rook. There's always the chance that it will get hit in the process.

Destroy 8 or more enemies with a single attack or spell.

Just get the spell pack that has the STATIC STORM ability. It attacks all enemies for 10 damage.
Then you just need to get to area 5 where you will wait for a Gemefied Cannon to appear. Do not kill any of them and let their turn happen. They will fire a massive line across the board dealing damage and leaving crystal barriers. You then need to activate STATIC STORM and target those barriers. If there are 8 or more barriers then BAM! ACHIEVEMENT GOT!

Have a hero make an attack at 6 or more Range.

Put all of your upgrades into either the mage class or the Ranger/Rogue class eventually you will have near unlimited range. In the case of the mage there is a random upgrade called meditate I think that let's you hit anywhere on the map from any position.

Recover every book in your bookshelf

These are the upgrades you buy with gems that you get when you finish a stage. You need 45 gems total.

Have a unit have 25+ armor at the end of their turn

Another one I think you will just get naturally but if you put everything beneficial into the Warrior then he will get it just from the sheer virtue that his upgrades are defensive.

Defeat Azasz and Jezebel in the final battle.

Beat ascension rank 10. This will have all of the modifiers on and will make things rather annoying in some areas but nothing that should be too difficult. By this point I was using the Elf Commander, Black Witch, and the Mercenary. The Mercenary and Black Witch where the ones I upgrade most with little going to the Elf Commander. Don't go for anything armor related only power. You need to kill the waves before they can get a shot off. The final wave of the game you will go against both of the previous end game bosses at the same time. To safely deal with this you need to deal massive damage (100+) to both and they will stealth taking away their attack next turn. Then you can deal with the mobs that have appeared. If your lucky on the runs this should be manageable.

Beat a run in under 20 minutes.

The only way I can recommend this to just once again go with the all in strategy on one unit whether the effect is good or bad. You just do not have the time. I think it counts even in the
upgrade areas so only level up the main character until maxed and only upgrade the damaging towers. Don't forget to turn off all modifiers. I did this with the Black Witch, Barbarian, and Ranger. With all of my upgrades going into the Ranger. She able to hit all of the tiles on the map while next to the crossbow tower and hit 2 enemies when she fired. Easily was hitting for 70+ per swing.

Unlock an alternate hero.

Just keep playing with new modifiers or just buy new units with gems. Won't unlock till you are in battle with the new unit.

Stun the same enemy with freeze traps twice.

First make sure you have the freeze trap. Then on area 3 with the shrooms it has the same opening spawn, leaving you with a predictable way to do this. Put one freeze trap right next to the right or left middle enemy. Either the middle or the uppermost enemy will trigger the trap. Then wait till next turn and put another trap between you and them. They will always go in the shortest path
to your heroes.

Complete a run with 12 or more Rare upgrades

Completely RNG dependent but will more than likely get naturally with the All In achievement. Still not sure how to tell what rarity things are.

Complete a run while ONLY taking Common upgrades when offered.

Not sure what the rarities are but I did 2 runs where I only took the blue upgrades, which are the basic ones that you can get. Did not upgrade the towers, Rook, Heroes, or objects and yet the achievement still did not appear. I have a theory that the thing canceling this out is the upgrades you get from the boss round which are yellow. You are forced to take those so it very well might be an unobtainable achievement atm.

EDIT 12/22/21: As of today thanks to Jean de Fatou I was informed that the achievement is now obtainable. I reinstalled the game and sure enough I got it on the first run. ONLY TAKE BLUE UPGRADES! Do not invest your gold or xp in anything whatsoever.

EDIT 07/21/24: Thanks to slavemaster he has confirmed that you can indeed spend your gold and XP to make things less difficult!

CREDIT TO Silverika
Spellslinger
Cast 10 Spells in the same round.

For this you will need very specific things to happen during your run. Always start with the Sanctuary Rook. It gives you one free cast of whatever spell you want when it's the first one used (Tier 3 clone is a pretty good choice) The hardest thing will be getting a loot that gives the ability to cast another of your spells. I believe I have only ever seen this on the Mage class. So to give a better chance of it showing up go all in on the mage to burn through the loot pool and hope that one of those appears. When it does from that moment on do not use a spell on turn 1 of the area. Wait until the second wave. In my case I needed to kill something to replenish the tier 1 spell but just to be safe I used the clone spell and had to mages kill 1 thing each. Then once you've gone through all of the spells and they all show zero end the turn. The achievement will pop at the beginning of the next turn.

For mine I had the recharger spell

Here I'll add stuff that's put in the comments. It might help others if my strategies don't work out for some people =P

Credit:Kienan

Truly Gifted : This may have been a patch since the guide was written, but it says in the gold shop what rank abilities are; you can actually take anything except the last upgrade, which is epic. So you can spend your gold, just don't max out any tree. You don't have to completely starve yourself.

Hammer of the Gods : Another good spot to get this is, still using Static Storm, the fungal level (Level 3.) A lot of these guys have low health, I got this achievement by wounding two or three, and everyone else was below the threshold. Activate the spell, and you're good to go.

Sniper is really simple. There's a low-tier spell that gives +2 range, and has four charges. You can just dump that all on one hero in a turn, and you're at 8+ range right there; no skills or anything needed.

Speedrunner thankfully (I hate having to go fast) isn't as bad as I thought, and I got it without trying. As you say, just try to dump abilities mostly on one hero to keep things simple, and go fast. It's somewhat RNG dependent, but I had good luck with traps/rearming/+10 damage (rogue/ranger/etc. hero), and anything trap related. It ends up taking out everyone for free, greatly speeding up the run. If you get the right skills, you'll kill almost the entire wave for free without even having to click. Less running around and less clicking = MORE SPEED. VROOM VROOM.

Deep Freeze doesn't require any special setup or level. As you say, enemies move predictably. Just place one trap, stun someone. Move everyone away except one hero, and the enemy will beeline for them. Set another trap between them, and you're good.