Here is the full list of all 27 FaceBreaker achievements worth 1,000 gamerscore.
Complete Brawl for it All on Impossible difficulty with any character
Complete Brawl for it All with all of the characters
Complete Brawl for it All without being knocked down on Truculent
Complete Brawl for it All without losing
Complete Brawl for it All with a Photo Game Face™ boxer
Complete Brawl for it All
Beat Tiki in Brawl for it All
Beat Socks in Brawl for it All
Beat Brick in Brawl for it All
Beat Voodoo in Brawl for it All
Beat Steve in Brawl for it All
Win 50 ranked matches
Win 25 ranked matches
Stun an opponent 15 times and win in a ranked match or against the CPU
In a ranked match or against the CPU get knocked down twice then Facebreaker or get 3 knockdowns
Win a ranked or VS CPU match while using a combination of 12 Sky or Groundbreakers
K.O. an opponent in a ranked match or the CPU in less than 1 minute
Win 10 ranked matches
Win a fight with FaceBreaker against an opponent in a ranked match or the CPU
Win a match without blocking, parrying or dodging against an opponent in a ranked match or the CPU
Win a match without getting hurt against an opponent in a ranked match or the CPU
Win 1 ranked match with a Photo Game Face™ boxer
Win 1 ranked match
Create a Photo Game Face™ boxer
Upload a Photo Game Face™ boxer
Download a Photo Game Face™ boxer
Upload a video