Here is the full list of all 30 Teenage Mutant Ninja Turtles: Out of the Shadows achievements.
KO 100 enemies with Raph.
Perform a stealth KO 25 times.
KO 100 enemies with Don.
KO 25 enemies with a Special Attack.
Complete Chapter 3.
Complete Chapter 2.
KO 100 enemies with Leo.
Unlock Classic Mode.
KO 100 enemies with Mikey.
Complete Chapter 1.
Max out Leo's special weapon rank.
Shoulder run off 100 enemies with Leo.
Max out Don's special weapon rank.
Hit 25 enemies with Don's special pose attack.
Max out Mikey's special weapon rank.
Special taunt 100 times with Mikey.
Max out Raph's special weapon rank.
Tapout 25 enemies with Raph.
Perform a double counter 25 times.
Perform a special counter 25 times.
Perform a team attack 50 times.
Perform a TPKO on 100 enemies.
Perform a Shell Shock 100 times.
Perform a 4 turtle TPKO.
Perform a 99-hit combo.
Perform 12 attack variations in one combo.
Complete all challenges.
Complete round 20 in Survival Mode.
Complete the Arcade Mode.
Complete Chapter 4.