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