Tips are great, but instance (and achievement) is broken in July 2021.
Solo after many hours following the tips exactly, the most 'hits' achieved is 26, you need 30 (and that is with 13 in phase 1).
Duo, 100% miss rate, and instance does not progress past phase 1 (or first shooting phase after dodge phase)..
that is 100% miss rate for main (me) and partner... regardless of which target I aim /shoot at. and I tried every available target for at least 30-60 seconds each target..
So unless this is fixed, War eternal -> Visions of Dragonfall -> Vision is an impossibility...