Perform 5 unique environmental kills.

Completed the mission "Bright Lights, Flying City"

Find 75% of GPS caches.

Find 75% of all documents.

Complete all optional tombs.

Purchase all skills in one category.

Force an enemy to drop dynamite that kills two people when exploding.

Kill 25 unaware enemies.

Perform 15 finishers.

Perform 50 headshot kills in the single player campaign.

Completed the mission "Rising Action"

Killed a Constructor without it ever building another bot