Never trigger the alarm in 'Recon by Fire'.

Shoot three enemies while underwater in 'Wetwork'.

Find 20 intel fragments in Co-op.

Earn three Stars in 'Denied Area'.

Earn at least one Star in Co-op.

Finish all Campaign missions on Veteran or Realism difficulty.

Rescue the hostages in 'Countdown' without the enemies firing their weapons.

Kill gassed or blinded enemies using a Molotov, Semtex and Frag in 'Prison Break'.

Unlock the pro trials.

Kill three Enemies with the Riot Shield in the Campaign or in Co-op.

Finish 'Alone' without firing a gun.

In 'Dark Water' advance 90 meters towards the front of the ship without touching the deck.

Reach the penthouse in 'El Sin Nombre' without killing anyone or triggering the alarm.