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