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