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 the Panda's diorama in Axis Mundi.
Find Bliss in Axis Mundi.
Unlock all codebreaker modes.
Find Morty the robot in Axis Mundi.
Visit 15 different locations in Axis Mundi.
Find the Harvest Time rift.
Create 5 items in the Forge in Knight's Code.
Do 5 quests for the Clan Masters in Knight's Code.
Break out of the prison.
Collect 3 memories of Ken.
Collect 10 iron.
Get to the Umbra's House.
Use the cat go through the gate.
Gather 3 Poteto Gomuins in Knight's Code.
Get the maximum profession tier in at least two paths in one playthrough.
Use the brainfix on yourself.
Gain Trolls respect in the bar.
Win a gun duel with the sheriff.
Help the Bandit escape 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.
Create Ken's V-Ghost from his psychoscan.
Obtain the maximum profession tier.
Gain Sleeves respect in the bar.
Order a whiskey at Yet's bar.
Search all the trash bins in Fallen Hero.
Meet the diginet in the street.
Explore all death hypotheses in Fallen Hero.
Make Ken a pretty straightforward proposal.
Use your deduction at least 15 times.
Get a gun in Harvest Time.
Listen to the 3 tales from the Rusty Ed.
Find two ways to reach the graveyard.
Get 5000 Harvest Time's coins.
Get 50 information for deduction.
Fully expand your farm in Harvest Time.
Reach the Farm Level 5 in Harvest Time.
Help Ramon to force another player out from Twisted & Perverted.
Get 20 aspects.
Help Starlett get out of limbo.
Get 50 pieces of information for the codex.
Scratch Haggis' golden frame.
Complete the solitaire in Haggis' office.