Here is the full list of all 44 Long Gone Days achievements.
Pay a visit to a place you shouldn't enter
Upgrade a weapon for the first time
Reach the surface for the very first time
Deliver all of the bandages
Lie your way out
Hear some rumors about a missing officer
Have Lynn and Ivan join your party
Ask Ivan to translate the letter
Rescue as many animals as possible
Get something from Astromart
Defeat Lt. Gareth
Reach the northernmost state of Germany
Have Atiye join your party
Me fail English?
Go straight to bed
Spend some time watching old cartoons
Get everyhing in order
Learn to cook some perfect cutlets
Get scammed
Take 3 photos for a GS News reporter
Don't pet the dog
Defeat Mathias
Collaborate with Weber
Nice argument, but have you considered this?
Collect lots of newspapers
How did he get here?
Have Pascal join your party
Defeat Sgt. Branna
Reach the largest city in Poland
Are you sure you know the code?
Inspect the photo in Sylwia's room
Plans for a brighter future
Find who stole Adair's gloves
You like jazz?
Learn about Pascal's past
Learn about Atiye's concerns
Draw your very own sign
It's no use trying to sleep
Find the secret weapon prototype
Convince him
Defeat him
Show your true convictions
Manage to stop The Core
Planning to fail