PC:

Look up at the "Achievement Showcase" and click on "Perfect Games".

Xbox 360:

Assassin’s Creed (44/44)
Juju (19/19)
LEGO Batman: The Videogame (46/46)
Mini Ninjas (35/35)

Xbox One:

Assassin's Creed 2 (+ Battle Of Forli DLC & Bonfire Of The Vanities DLC) (The Ezio Collection) (50/50)
Assassin’s Creed Brotherhood (+Copernicus Conspiracy DLC & The Da Vinci Disappearance DLC) (The Ezio Collection) (50/50)
Assassin’s Creed Revelations (+ The Lost Archive DLC) (The Ezio Collection) (49/49)
Beyond Eyes (10/10)
Dear Esther: Landmark Edition (10/10)
Firewatch (10/10)
Never Alone (Kisima Innitchuna) (+ Foxtales DLC) (19/19)
Seasons After Fall (21/21)
Selma And The Wisp (11/11)
The First Tree (14/14)

Playstation 3:

Ratchet & Clank HD (35/35)
Ratchet & Clank 2 HD (35/35)