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