Kill 10 or more enemies with a single explosion (Tonkor, etc)

Complete any 5 Hive Infestation missions.

Set 10 hostages free without triggering the execution timer

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

Polarize a Weapon, Sentinel, Kubrow, or Warframe

Score a kill with your equipped primary, secondary and melee weapons in 5 seconds or less.

Complete 10 Void Fissure missions

Complete 10 Nightmare missions.

Complete a Hijack mission without allowing the payload to travel backwards.

Solve 10 Ciphers.

Complete an Interception node and extract with the enemy capturing 40% or less territory.

Deflect 1,000 projectiles with your melee weapon.