Here is the full list of all 26 BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien achievements.
Get a Triple Perfect+ on Every Level
Complete all 90 Rewards
Beat all Levels in Hard Difficulty
Get three Triple Perfects in Each World
Get two Double Perfects in Each World
Complete World 5
Get one Perfect Run in Each Level
Complete 80 Rewards
Get one Perfect+ in Each World
Complete World 4
Complete World 3
Complete 70 Rewards
Beat 30 Levels as Alternate Characters
Complete 60 Rewards
Complete World 2
Complete 50 Rewards
Checkpoints!? Who Needs 'Em!?
Complete 40 Rewards
Dance 100 Times
Complete World 1
Unlock a New Character
Run a Marathon
Complete 30 Rewards
Complete 20 Rewards
Complete 10 Rewards
Get a Bullseye