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