Here is the full list of all 23 Deformers achievements.
Score 50 goals in Form Ball
Score 25 goals in Form Ball
Kill an enemy using the pit in the center of Big Top
Get 500 Kills
Reach Silver ranking in Prestige
Complete a match online in Splitscreen
Reach Level 10
Get 250 Kills
Break 100 stacks
Get 100 Kills
Kill an enemy while you're cloaked
Consume 5000 pieces of debris (including gibs)
Get 50 Kills
Earn your first Prestige rank
Score a Hat Trick in Form Ball
Score a goal in Form Ball
Complete an online match
Level up!
Get 5 kills with a single Rampage
Reach Level 20
Reach Gold ranking in Prestige
Get 15 Assists in Form Ball
Get 10 Saves in Form Ball