Here is the full list of all 39 Blacksad: Under the Skin achievements.
Find all false endings in the game.
Watch all 6 alternate scenes at the end of the game.
Now for real.
Complete the game without dying a single time.
Complete the game dying less than 9 times.
Complete all deductions in the game.
Contribute to as many deaths as possible.
Get hired twice for the same case.
Take 400 nightstick blows. Maybe a few less.
Put your acting skills to the test.
Take a ride with the city's most honest bookmarker.
Complete the Boxing sheet of the Hall of Fame album.
Complete the Hall of Fame album.
Complete the Baseball sheet of the Hall of Fame album.
Buy your favorite goat a second burger.
Complete the Hockey sheet of the Hall of Fame album.
Complete the Football sheet of the Hall of Fame album.
Solve the case.
Interact with as many books as you can.
Take your sixth beating.
Do not scare Brunhilda while telling her a story.
Beat someone up for once.
Play baseball.
Complete Blacksad's silence conveniently.
Stand up to Sam as many times as you can.
Play good cop convincingly.
Play bad cop convincingly.
Take your fifth beating.
Why's that poster in Dunn's flat?
Stand up to Quince as many times as you can.
Help the Colberts live a second honeymoon and receive their gratitude.
Charm Helen Moore into giving you a present.
Take your fourth beating.
Buy a box of cigarettes from the nursing staff.
Take your third beating.
Do not take the case.
Take your second beating.
Find your most valuable tool.
Take your first beating (spoiler: it won't be the last!).