Elephants Never Forget achivement not unlocked

[yumyumyumyumyumyum]

in game challenges successfully completed but not steam page
i tried on main story and escalation

[Kunovega]

Did you shoot all the elephants, go outside and look at the elephants crying blood, get the challenge unlocked, finish the mission? and then exit all the way out of the game?

https://www.youtube.com/watch?v=nMXtbvasHs8