Here is the full list of all 53 Gamedec achievements.
The base game contains 52 achievements, and there is 1 DLC pack containing 1 achievements.
Destroy the simulation
Escape from the simulation.
Agree with the simulation owners
Help Rhonda find her son.
Gather a team of at least 3 people.
Lock 3 characters in the loop in Paradise Beach.
Get to the Paradise Beach.
Find Bliss in Axis Mundi.
Visit 15 different locations in Axis Mundi.
Find the Panda's diorama in Axis Mundi.
Find the Harvest Time rift.
Find Morty the robot in Axis Mundi.
Unlock all codebreaker modes.
Do 5 quests for the Clan Masters in Knight's Code.
Get to the Umbra's House.
Break out of the prison.
Collect 3 memories of Ken.
Create 5 items in the Forge in Knight's Code.
Collect 10 iron.
Gather 3 Poteto Gomuins in Knight's Code.
Use the cat go through the gate.
Create Ken's V-Ghost from his psychoscan.
Use the brainfix on yourself.
Gain Trolls respect in the bar.
Gain Sleeves respect in the bar.
Order a whiskey at Yet's bar.
Use your deduction at least 15 times.
Explore all death hypotheses in Fallen Hero.
Get 50 information for deduction.
Meet the diginet in the street.
Search all the trash bins in Fallen Hero.
Make Ken a pretty straightforward proposal.
Get the maximum profession tier in at least two paths in one playthrough.
Win a gun duel with the sheriff.
Help the Bandit escape in Harvest Time.
Obtain the maximum profession tier.
Get 5000 Harvest Time's coins.
Listen to the 3 tales from the Rusty Ed.
Find two ways to reach the graveyard.
Get a gun in Harvest Time.
Fully expand your farm in Harvest Time.
Reach the Farm Level 5 in Harvest Time.
Find all the clues written on the boards.
Help Fredo in Like Father Like Son.
Surprise Jester in the theater.
Complete all the fetchquests from Troll King.
Help Ramon to force another player out from Twisted & Perverted.
Get 20 aspects.
Get 50 pieces of information for the codex.
Help Starlett get out of limbo.
Scratch Haggis' golden frame.
Complete the solitaire in Haggis' office.