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