For anyone wondering what the challenges are:
50 Eliminations with Primary weapons
Complete 100 Void Objectives
500 Elims with Launchers or Equipment
Upgrade your Artifact 25 times
50 Slaughter medals with Assault Rifles
100 Kills with War Machine
Eliminate 25 Zaballa
Equip 3 Legendary Covenants in 5 games
1000 Eliminations with LMGs
Use equipment to kill 10 Sturmkreiger
Complete 3 Sacrifice objectives without losing a Ritual Site
Get 75 kills with Incendiary Grenades(not in game)
Get 1000 or more eliminations in 3 separate games
Get 150 Critical Kills with Pistol
Use a Monkey Bomb to lure Zabellas electrical attack 5 times
500 Wonder Weapon eliminations
Kill 10 or more enemies with a single explosion 3 times
Get 100 Kills with the Death Machine
Get 100 kills with an Artifact tier 3 or higher
Defeat 10 Sturmkreigers with WW or Support.
There is no Incendiary Gernades in the game yet. I guess we have to wait for another update.