Here is the full list of all 40 Bitardia achievements.
The base game contains 37 achievements, and there is 1 DLC pack containing 3 achievements.
Served a term in prison
Kill anons on the first mission
Rob the caravan
Finish the "Fifth Column" quest
Get to jail while taking the camera
Get arrested for spoiling the stand
Buy a pillow for anon
Finish the "QT 3.14" quest
Break out of prison
Get to jail after showing the video
Kill cancer on the first mission
More than 100 killed on arena
Get some cash on arena
Rescue the hostage
Take the guard quest
Kill Cancer on the first mission
Pick Anon Mask
Pick Cancer Mask
Take the builder quest
Explode the building
Get to jail after talking to police
Get to jail after entering the police station
You didn't accept the note-finding mission
You have finished the note-finding mission
Finish the "Hotline Bitardia" quest
Beat anon in cards
To die, refusing to work on the Abu
Agree to work on Abu
Finish a halloween-quests
Finish the "Winter is coming" quest
Finish the "Missing part" quest
Finish the "Fifth wheel" quest
Take care of the hospital
Return anon's debt
Take care of the bank
Agree to work for resistance