Full list of all 25 Trombone Champ achievements. It takes around 5-6 hours to unlock all of the achievements in the base game on Windows.
The base game contains 21 achievements, and there are 2 DLC packs containing 4 achievements.
Become the Trombone Champ of Legend
Receive an "S" score on twenty or more tracks
Unlock all Sound Sets
Receive an "S" score on fifteen tracks
Unlock a Sound Set
Unlock all trombone colors
Receive an "S" score on ten tracks
Meet Bassmaster Ben
Unlock a trombone color
Express your love of baboons
Turd your last Mozart card
Abstain from tooting
Abstain from sound completely
Get 50 Tromboner Cards
Play at least 20 tracks
Meet a Mysterious Friend
Receive an "S" score on five tracks
Meet Tootmaster Tom
Develop an enormous brain full of facts
Get a sack
Receive an "S" score on one track
Receive an "S" score on twenty-five or more tracks
Receive an "S" score on thirty or more tracks