History of Crack Shot

Crack Shot is a triumph for defeating Guardians in Invasion with precision final blows (objective: 25 precision kills).

How to complete

1. Play Invasion and aim for the head or other critical spot of enemy Guardians; only the shot that finishes the target counts, and not every target has the same crit spot.
2. Use a precision-friendly weapon (hand cannon, scout rifle or pulse rifle) so that the final shot is a crit rather than body damage.
3. Hits on combatants do not count; the progress is Guardians only.

Category and reward

Search results list it as a Season 28 triumph in the Invasion category. I could not open a page confirming which seal it belongs to or its reward, so that is unconfirmed.

Sources note

The requirement text comes from the game data and a search summary of the light.gg entry (light.gg itself blocks fetching). The precision-final-blow definition comes from the Bungie.net forum thread opened for this page.