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