Here is the full list of all 16 Shift achievements.
Play 100 Quick Matches
Win 50 Quick Matches
Complete all 40 levels in Ranking Mode
Win 25 Quick Matches
Play 50 Quick Matches
Complete 30 levels in Ranking Mode
Win the level with more than 350 Time Bonus points
Win the level with more than 250 Time Bonus points
Win 10 Quick Matches
Win the level with more than 1600 points
Complete 20 levels in Ranking Mode
Complete 10 levels in Ranking Mode
Win the level with more than 1000 points
Win the level with more than 1200 points
Win the level with more than 150 Time Bonus points
Play 10 Quick Matches