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