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
Lock 3 characters in the loop in Paradise Beach.
Get to the Paradise Beach.
Visit 15 different locations in Axis Mundi.
Find Bliss in Axis Mundi.
Unlock all codebreaker modes.
Find Morty the robot in Axis Mundi.
Find the Harvest Time rift.
Create 5 items in the Forge in Knight's Code.
Break out of the prison.
Collect 3 memories of Ken.
Get to the Umbra's House.
Use the cat go through the gate.
Gather 3 Poteto Gomuins in Knight's Code.
Create Ken's V-Ghost from his psychoscan.
Gain Trolls respect in the bar.
Order a whiskey at Yet's bar.
Use the brainfix on yourself.
Explore all death hypotheses in Fallen Hero.
Search all the trash bins in Fallen Hero.
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.
Fully expand your farm in Harvest Time.
Get a gun in Harvest Time.
Get 5000 Harvest Time's coins.
Get 50 information for deduction.
Reach the Farm Level 5 in Harvest Time.
Complete all the fetchquests from Troll King.
Help Ramon to force another player out from Twisted & Perverted.
Get 50 pieces of information for the codex.
Get 20 aspects.
Complete the solitaire in Haggis' office.
Scratch Haggis' golden frame.
Help Starlett get out of limbo.
Surprise Jester in the theater.
Help Fredo in Like Father Like Son.
Find all the clues written on the boards.
Find two ways to reach the graveyard.
Help the Bandit escape in Harvest Time.
Meet the diginet in the street.
Gain Sleeves respect in the bar.
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.
Gather a team of at least 3 people.
Destroy the simulation
Escape from the simulation.
Make Ken a pretty straightforward proposal.