To unlock it you must have a pre-House of Wolves exotic weapon that has the yellow "Ascend" upgrade node on the left side of the upgrade tree. This will require you to use an exotic shard to bring the weapon up to the new 365 damage cap, in addition to filling in every other upgrade node as well. This change renders the trophy unobtainable for now for anyone without an old exotic weapon. Nevertheless, you can get a "Pre-HOW" from the VoG (Raid Venus), for example, the Vex Mythoclast have the option "Ascend". https://www.bungie.net/es/Forum/Post/122119622/0/0/1