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