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.
Use the cat go through the gate.
Meet the diginet in the street.
Find the Panda's diorama in Axis Mundi.
Escape from the simulation.
Destroy the simulation
Agree with the simulation owners
Help Rhonda find her son.
Gather a team of at least 3 people.
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 the Harvest Time rift.
Find Morty the robot in Axis Mundi.
Get the maximum profession tier in at least two paths in one playthrough.
Break out of the prison.
Collect 3 memories of Ken.
Create 5 items in the Forge in Knight's Code.
Do 5 quests for the Clan Masters in Knight's Code.
Get to the Umbra's House.
Collect 10 iron.
Gather 3 Poteto Gomuins in Knight's Code.
Create Ken's V-Ghost from his psychoscan.
Use the brainfix on yourself.
Gain Trolls respect in the bar.
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.
Help the Bandit escape in Harvest Time.
Make Ken a pretty straightforward proposal.
Win a gun duel with the sheriff.
Use your deduction at least 15 times.
Get 50 information for deduction.
Get 5000 Harvest Time's coins.
Listen to the 3 tales from the Rusty Ed.
Find two ways to reach the graveyard.
Get a gun in Harvest Time.
Obtain the maximum profession tier.
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.
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.
Help Starlett get out of limbo.
Complete the solitaire in Haggis' office.
Scratch Haggis' golden frame.