I've been in a group with a friend and 2 ppl gathered through the duty finder on the last day of P4.. we've done Sastasha and at mid dungeon (about after the second captain) the 2 duty finder guys actually got the achievement even if it was their first time doing the dungeon, while my friend an i didn't get anything even after the full clear and still don't have it 4 runs after that. This totally needs a fix..