In multiplayer, clobber one of your chums as the champ.

Completed your first Twilight mission.

Complete Act 2

Met with Tokugawa Ieyasu.

Get Spectacular or better in a Taskmaster Bomb Challenge

Complete Act 1

Defeat Shocker

All Surveillance Towers activated

Kill an enemy from over 100 metres away across the Plains of Eidolon

Complete any 10 missions with a Kubrow equipped.

Complete The War Within Quest

Reach Rank 30 with a polarized Weapon, Sentinel, or Warframe

Complete 20 waves of Defense and successfully extract