Complete Outside Contact

Perform a melee kill while you're in Overkill

Complete a mission (excluding New Blood) with a human partner

Level up to Rank 5

Complete Cause and Effect

Make your first kill as a rookie (in Cause and Effect mission)

Place in the top 25% of players in the online scoreboard for a Story level

Score a 5x multiplier in a Story level

Finish the game in Normal Mode

Defeat five enemies in a row with headshots

Defeat 30 enemies with the Mk-NDI

Defeat 30 enemies with the SAS - 12

Defeat 100 enemies with headshots