Fully mod and completely upgrade any weapon.

Find 75% of all documents.

Kill 35 enemies with the pistol.

Find 75% of GPS caches.

Purchase all skills in one category.

Kill 75 enemies with the rifle.

Perform 50 headshot kills in the single player campaign.

Use a Pay 'n' Spray with wanted level.

Uncovered the secret of Dionysus Park.

Installed the third upgrade to a weapon.

Spent 2000 dollars at Vending Machines.

Researched a Splicer with the Research Camera.

Defended yourself against the Big Sister without dying.