Optional objective won’t achieve/unlock
Hello,
In the mission “A Bitter End” in Sequence 9, I am unable to unlock the optional objective “perform sequential kills (kill streak) -3”. I’ve tried for to get it for about an hour and a half - I’ve tried counter attacks only, regular attacks without being interrupted, and killing several enemies (like 10+) without being interrupted and the optional objective won’t complete.
Early on when I tried to complete it I thought it may not unlock until I moved on and completed the main objective (kill all the officers on board), and I went forward but it didn’t unlock - failed with the red x. Went and replayed the whole mission to get to this part where I’ve been stuck for a while.
Thank you!