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