Here is the full list of all 12 Shoot Shoot Mega Pack achievements.
Play every preset game
Make and play 4 unique faves
Unlock all rules in the game
Defend against 25 bullets
Have a match go into SUDDEN DEATH
Win a match with a shutout
Move at max sync thrust speed for 10 seconds
Fall into a void and survive
Hit a player by banking a shot off of a deflector shield
Trap more than one player with a zap pad detonation
Shoot a player right after you've teleported
Play 400 Matches