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