Here is the full list of all 17 Gerritory achievements.
Complete all three tutorial levels
Take over more than 60% of the tiles in a level
Complete 1 round match with 2 or more players
Complete 10 round matches with 2 or more players
Complete 100 round matches with 2 or more players
Complete 10 round matches with 2 or more AI players
Die over 20 times
Die over 200 times
Crush your opponents over 5 times in one game
Crush your opponents over 10 times in one game
Eat 5 powerups in one game
Acquire a level-unlock key for the first time
Unlock more than 25 levels
Crush 3 opponents in 7 seconds
Play through a game of tag level without dying once
Play through an air raid level without dying once
Eat an invincible powerup in a game of tag level