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