Destroy 4 trucks with 4 drone strikes before they reach the end of their path in 'The Embassy'.

Do not injure any civilians in 'Piccadilly'.

Complete the campaign on 'I'm Too Young to Die', 'Hurt Me Plenty', 'Ultra Violence', or 'Nightmare'.

Defeat the Cyberdemon

Acquire the BFG

Glory Kill all common enemy types in the campaign.

Fully upgrade a Praetor Suit category.

Finish Chapter Four

Reach level 10

Spend 100.000 Skell Credits.

Kill 2 enemies with a single rocket.

Kill an helicopter's pilot with any weapon.