Destroy the helicopter without defeating any other enemies

Plant multiple C4 charges on the APC at the same time and destroy it with one massive detonation

Defeat 4 enemies with the vehicle in 20 seconds

Listen to all optional conversations

Defeat 5 consecutive enemies with the silenced pistol without being detected

Open every lockbox

Ask Skeleseer a question

Get 30 seconds of total airtime with the vehicle

Commandeer 6 vehicles by jumping on them and kicking out the driver

Stealth take-down 10 armored enemies with melee by first removing their helmets without being detected

Defeat 20 enemies blind-firing from cover

Get through all 3 Axe Fort trials without resetting any boards

Perform 5 grapple swings in a row without touching the ground