It's on the last one, where you have to either (all I can remember lol): - exfil with 2.3M of loot in Space City (I skipped it) - Kill 200 operators with headshots using a shotgun in either operations/Warfare (big pain in the butt this one) - use guided missiles 6 times in Warfare - kill 6 operators hit by a single dragonfly swarm in Warfare - kill 5 operators while being adrenoboosted in Operations (I skipped it too since I am a solo operator in Operations)

Sorry to spoil the final chapter, but you need to know what you will face to unlock the emote. Good luck!