Mosquitoes, wasps, yellow jackets, roaches, random beetles, ticks, spiders, and probably a few other types of insect creatures.
All killed through a variety of methods, including crushed with newspapers, drowned, crushed with shoes, crushed with my bare hands, poisoned with raid, vroomed with a lawnmower, etc.
And for ticks specificaly gradually dismembered with rocks and/or my fingernails, they are resilient little buggers.
With my car I've hit a small yellow bird, no idea where it came from just hit my windshield at 60mph, presumably it died but I didn't confirm the kill. Also a small running animal at night, idk what it was possibly a small dog or a cat, or just a squirrel again I didn't go back for confirmation.
While mowing I took off the top of a turtle's shell by accident, I felt really bad, not sure if it survived but it's possible.
I also hit a very large (5-7') snake with 20+ (frozen) rounds from my paintball gun, most shots were to the head but I also targeted the body. Eventually it went limp, and I went back inside to play Civ and think about how to dispose of the body, when I went back out it was gone. So it may well have brain damage, but likely survived my attack.
That's all I can think of for now.