Complete the Saya's Vigil quest

Destroy 200 Corpus Crewman helmets.

Begin Genetic Lab Incubation for a Kubrow.

Successfully perform 100 stealth kills

Apply 4 different Mods to a single weapon or Warframe.

Solve 10 Ciphers.

Deal damage to every enemy champion in a match before any of them damaged you.

Kill more than 20 enemy champions in a single Siege match.

Get a killing blow after the Round has ended.

Win a match where the enemy team scored no points.

Kill a player with an environmental hazard.

Kill an enemy player while you are at or below 50 Health.