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