Here is the full list of all 44 RhythmSnake achievements.
Collect more than 30 food in a track less than 5 minutes long
Rack up 5000 points in a track less than 10 minutes long on difficulty level 1
Rack up 10000 points in a track less than 10 minutes long on difficulty level 1
Rack up 20000 points in a track less than 10 minutes long on difficulty level 1
Rack up 30000 points in a track less than 10 minutes long on difficulty level 1
Rack up 40000 points in a track less than 10 minutes long on difficulty level 1
Rack up 50000 points in a track less than 10 minutes long on difficulty level 1
Rack up 5000 points in a track less than 10 minutes long on difficulty level 2
Rack up 10000 points in a track less than 10 minutes long on difficulty level 2
Rack up 20000 points in a track less than 10 minutes long on difficulty level 2
Rack up 30000 points in a track less than 10 minutes long on difficulty level 2
Rack up 40000 points in a track less than 10 minutes long on difficulty level 2
Rack up 50000 points in a track less than 10 minutes long on difficulty level 2
Rack up 5000 points in a track less than 10 minutes long on difficulty level 3
Rack up 10000 points in a track less than 10 minutes long on difficulty level 3
Rack up 20000 points in a track less than 10 minutes long on difficulty level 3
Rack up 30000 points in a track less than 10 minutes long on difficulty level 3
Rack up 40000 points in a track less than 10 minutes long on difficulty level 3
Rack up 50000 points in a track less than 10 minutes long on difficulty level 3
Rack up 5000 points in a track less than 10 minutes long on difficulty level 4
Rack up 10000 points in a track less than 10 minutes long on difficulty level 4
Rack up 20000 points in a track less than 10 minutes long on difficulty level 4
Rack up 30000 points in a track less than 10 minutes long on difficulty level 4
Rack up 40000 points in a track less than 10 minutes long on difficulty level 4
Rack up 50000 points in a track less than 10 minutes long on difficulty level 4
Set records on all the default tracks
Collect more than 50 food in a track less than 5 minutes long
Collect more than 70 food in a track less than 5 minutes long
Complete a track longer than 3 minutes without making a mistake and collect more than 25 food on difficulty level 1
Complete a track longer than 3 minutes without making a mistake and collect more than 25 food on difficulty level 2
Complete a track longer than 3 minutes without making a mistake and collect more than 25 food on difficulty level 3
Complete a track longer than 3 minutes without making a mistake and collect more than 25 food on difficulty level 4
Complete a track longer than 5 minutes without making a mistake and collect more than 25 food on difficulty level 1
Complete a track longer than 5 minutes without making a mistake and collect more than 25 food on difficulty level 2
Complete a track longer than 5 minutes without making a mistake and collect more than 25 food on difficulty level 3
Complete a track longer than 5 minutes without making a mistake and collect more than 25 food on difficulty level 4
Set a record on 10 tracks
Set a record on 20 tracks
Set a record on 50 tracks
Set a record on 100 tracks
Earn more than 10,000 points each in a two-player game
Earn more than 10,000 points each in a three-player game
Earn more than 10,000 points each in a four-player game
Earn more than 10,000 points each in a five-player game