Here is the full list of all 30 Teenage Mutant Ninja Turtles: Out of the Shadows achievements worth 400 gamerscore.
KO 100 enemies with Mikey.
KO 100 enemies with Raph.
Max out Mikey's special weapon rank.
Max out Don's special weapon rank.
KO 100 enemies with Don.
Max out Leo's special weapon rank.
Complete Chapter 4.
Complete Chapter 3.
Perform a stealth KO 25 times.
Complete Chapter 2.
Perform a TPKO on 100 enemies.
Unlock Classic Mode.
KO 25 enemies with a Special Attack.
Complete Chapter 1.
KO 100 enemies with Leo.
Shoulder run off 100 enemies while playing as Leonardo.
Hit 25 enemies with Donatello’s special pose attacks.
Taunt 100 enemies with Michelangelo’s special taunt.
Achieve Level 3 with Raphael’s Iron Fists.
Use Raphael’s Counter Submissions 25 times.
Perform a double counter 25 times.
Perform a special counter 25 times.
Perform a team attack 50 times.
Perform a Shell Shock attack 100 times.
Perform a 4-Turtle Turtle Power Knock Out.
Perform a 99-hit combo.
Perform 12 attack variations in a single combo.
Complete all Challenge levels.
Complete round 20 in Survival mode.
Complete all Arcade levels.