Excluding clone-troopers and only in live acted Star Wars, Stormtroopers (sometime from off screen) have hit:

1. All kinds of rebels on various planets in "Andor"
2. A whole bunch of rebels in "rogue one"
3. A bunch of rebels on the Tantive IV
4. Leia (with a stunner) on the Tantive IV
5. All those poor Jaws, plus Luke's family.
6. The hull of the millennium falcon (to no effect)
7. A bunch of rebels on Hoth
8. C-3P0 in cloud city
9. Luke's lightsaber blade in cloud city
10. Leia on endor's forest moon
11. R2D2 on endor's forest moon
12. At least a few ewoks on endor's forest moon.
13. Din Djarin's beskar armor
14. A bunch of other mandaloroans and extras
15. Some of those turtle-riding aliens in a distant galaxy in "Asoka"
16. A bunch of innocent villagers on Jaku
17. Poe's parked X-wing (to great effect!)
18. Poe in the arm
19. Rei's lightsaber blade a bunch of times
20. The hull of the millennium falcon (again, to no effect)

I think stormtroopers are more effective than Klingons, federation red-shirts, or the borg.