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