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