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