Here is the full list of all 29 Hopalong: The Badlands achievements.
Defeat 200 bandits
Defeat 500 bandits. Woah nelly that's some good shootin'!
Defeat 1000 bandits. Uhhh, you okay sheriff? Why don't you sit back and relax for a bit...
Defeat the mad, maxed out Boomity one-on-one in the Powderdome
Defeat Boss Boomity
Unlock all Bounty achievements
Complete the Outskirts chapter
Complete the Canyon chapter
Unlock all horses
Unlock all weapons
Kill a bandit by shooting dynamite back at them
Use a boulder to kill a bandit
Kill 3 or more bandits with a single barrel explosion
Kill 5 or more bandits with a single barrel explosion
Kill two bandits with one shotgun blast
Destroy 50 tombstones
Destroy 200 tombstones
Complete the Outskirts chapter without dying or killing any bandits
Kill a bandit by knocking their dynamite back at them with a pick
Kill 4 or more bandits while Quick Draw is active
Defeat Boss Boomity while wielding his flying pig and dynamite
Collect all sheriff stars in the Outskirts chapter
Collect all sheriff stars in the Canyon chapter
Collect all sheriff stars in the Showdown chapter
Unlock the true sheriff by collecting all sheriff stars in the game
Unlock the unicorn by logging 3 hours of hopping
Trick bandits into taking out 10 of their fellow Boomities
Trick bandits into taking out 50 of their fellow Boomities
Survive the battle at Boomity HQ and chase after Boss Boomity