You completed The Saboteur.

You beat Dierker in the Parisian race.

Campaign: 50 kills with sub machine guns

Campaign: find 15 collectable weapons

Recover from the Roxxon EMP attack.

Kill Zeus

Completely upgrade all weapons

Acquire the Boreas Icestorm

Solve Hera's Gardens

Solve 25% of riddler challenges

Open the Gates of Tisiphone

Kill the Poseidon Princess

Score over 9000 on 5 different songs on Easy (Unlocks a PlayStation®Home reward)