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