We completed this mission 2 times, 1 time a week ago, and 1 time a hour ago. We all equipped hawkmoon and do not unequip it until timer of completed mission ends and we have not received that triumph not on 1st try and not on 2nd. I think there are a bug. If you have battle logs, you may check it if you need. I cant attach all screenshot, there are 3 others: 2) https://steamuserimages-a.akamaihd.net/ugc/1765945409087453024/C1B4B21AD89F0E3786547121A0FF53BBF889B7AA/ 3) https://steamuserimages-a.akamaihd.net/ugc/1761441761930509941/40A5E4A4928575DFDDDC4F83BE74FBFDAA289FBD/ 4) https://steamuserimages-a.akamaihd.net/ugc/1761441761930477577/63AB3A36294A0C3C291E313E1E31FCA1BB47D24C/