Here is a little guide giving the buttons for Dev Mode + conditions for each achievement to be completed.

Don't hesitate to give any other information I could have forgotten. I'll read them for sure. ^^ (and maybe add them if I verify them)

Well, at least I have to thank someone for correcting me, so a section seems appropriate.

Thanks to:
george1, for his knowledge on Hunter, Gatherer and You get a plate achievement.

Please be sure to use with caution AND awareness: Those tools can reduce your time needed to make all the achievements and greatly reduce your full appreciation of the game. Please finish the game first and try to make all the achievements by yourself! (as much as possible)


Ctrl+Shift+F5: Engage/Disengage Dev Mode


----- Little Tools -----
F1 to F4: Quicksave
Ctrl+Shift+F1 to F4: Quickload a Quicksave
Shift+F12: High Res Screenshot
Y: Look around with the camera, Press again to end
U: Make static upgrade items (like tents/ovens/etc.) disapear/reappear
K: Randomize look (Doesn't count toward achievement Diva)


----- Game Killer -----
F5 to F8: Change speed to 1/3/10/20x (1x = normal speed | 3x = fast-forward speed)
F9/F10: Make plants grow at regular speed/real fast
7 to 0 (up the first row of letters): Set time to Morning/Noon/Evening/Night
T: +1 Dishes Accepted
G: Reset achievements!
Z: Make a zombie appear
B: +1000 plants & +100 seeds
M: Make a Survivor Helper appear (even if there isn't enough tents)

Be warned: I WON'T give you the instructions for getting the achievements. Someone already done a good guide about it even if there's some mistakes... :°), simply follow it:
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=273768147

Here is the list of achievements and their MINIMAL conditions, how the game see that a condition for an achievement is met.

------------------------

Achievement with original description
Achievement to be confirmed
Detail needing further precision

Golden Shovel: Player has the Golden Shovel equiped.
Golden Hammer: Player has the Golden Hammer equiped.
Golden Axe: Player has the Golden Axe equiped.
Golden Scythe: Player has the Golden Scythe equiped.
Full House: Player accepted 4 Survivor Helper.
Full Restaurant: Player accepted one customer and makes all 12 seats unavailable.
Oiled Machine: All stoves and juicers are currently working.
No Deal: Player accepted a request in which he get all the possessions of the requester against dinner and stones.
Mother Teresa: Player accepted to serve someone without get anything in return.
Gravedigger: All graves have been digged.
Savior: Player turned all the zombies back to normal in the forest.
Hunter: 5 zombie kill in a 15 second timelapse when one zombie is killed.
Gatherer: 50 harvest in a singe day. Don't include storing.
Farmers Market: Chest got 50 corns, 50 apples, 50 potatos, 50 tomatos, 50 lettuces, 50 grapes, 50 wheats, 50 eggs, 50 pumpkins, 50 grass, 50 milks, 50 carrots and 50 sugar beet after his content changed.
Fruit Ninja: Player got 3 star rating in all recipes at the end of a Learning Session
Hard Worker: Cut the 11 roots with Uncle in a specific ammount of time in Story introduction.
Architect: A zombie will take more than a night to come and attack anything in the player's camp
You get a plate: 15 dinners served in a single day (still on it)
Sitting Duck: Player got into a fight with a zombie 5 times
Daredevil: Player took the longest path in the forest by entering one specific entrance and going out of another specific one.
Hoarder: The chest got 500 items in total after his content changed.
Halloween 2014: All 10 pumpkins have been destroyed. (too lazy to check if this one or no pumpkin remain ^^)

Golden Chicken: Player is breaking the chicken statue
Why did the chicken cross the road?: Player got the golden chicken in hands and the chicken is at the other side of the path starting from the restaurant.
Diva: Player got in and out of the house 10 times.
Developer: Dev Mode is OFF and Player switch it to ON.