Here is the full list of all 39 Blacksad: Under the Skin achievements.
Complete the Hall of Fame album.
Complete the Baseball sheet of the Hall of Fame album.
Watch all 6 alternate scenes at the end of the game.
Find all false endings in the game.
Complete the Boxing sheet of the Hall of Fame album.
Help the Colberts live a second honeymoon and receive their gratitude.
Complete the Football sheet of the Hall of Fame album.
Do not take the case.
Complete the game dying less than 9 times.
Complete the game without dying a single time.
Contribute to as many deaths as possible.
Complete all deductions in the game.
Complete the Hockey sheet of the Hall of Fame album.
Interact with as many books as you can.
Take 400 nightstick blows. Maybe a few less.
Now for real.
Solve the case.
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.
Play bad cop convincingly.
Play good cop convincingly.
Take your fifth beating.
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.
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 your third beating.
Take a ride with the city's most honest bookmarker.
Buy your favorite goat a second burger.
Stand up to Sam as many times as you can.
Take your second beating.
Find your most valuable tool.
Take your first beating (spoiler: it won't be the last!).