Here is the full list of all 39 Blacksad: Under the Skin achievements.
Complete the Hall of Fame album.
Complete the Hockey sheet of the Hall of Fame album.
Watch all 6 alternate scenes at the end of the game.
Contribute to as many deaths as possible.
Complete the Football sheet of the Hall of Fame album.
Do not scare Brunhilda while telling her a story.
Why's that poster in Dunn's flat?
Charm Helen Moore into giving you a present.
Get hired twice for the same case.
Stand up to Sam as many times as you can.
Buy your favorite goat a second burger.
Take 400 nightstick blows. Maybe a few less.
Find all false endings in the game.
Do not take the case.
Complete the Baseball sheet of 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 all deductions in the game.
Complete the Boxing sheet of the Hall of Fame album.
Solve the case.
Take your sixth beating.
Beat someone up for once.
Play baseball.
Complete Blacksad's silence conveniently.
Play bad cop convincingly.
Play good cop convincingly.
Take your fifth beating.
Interact with as many books as you can.
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.
Take your fourth beating.
Take a ride with the city's most honest bookmarker.
Take your third beating.
Buy a box of cigarettes from the nursing staff.
Take your second beating.
Find your most valuable tool.
Take your first beating (spoiler: it won't be the last!).