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.
Receive an "S" score on twenty or more tracks
Receive an "S" score on fifteen tracks
Receive an "S" score on ten tracks
Receive an "S" score on five tracks
Become the Trombone Champ of Legend
Unlock all Sound Sets
Meet Bassmaster Ben
Unlock all trombone colors
Unlock a trombone color
Meet a Mysterious Friend
Get 50 Tromboner Cards
Unlock a Sound Set
Play at least 20 tracks
Meet Tootmaster Tom
Turd your last Mozart card
Abstain from tooting
Receive an "S" score on one track
Get a sack
Develop an enormous brain full of facts
Express your love of baboons
Abstain from sound completely
Receive an "S" score on thirty or more tracks
Receive an "S" score on twenty-five or more tracks