Here is the full list of all 23 Turnip Boy Robs a Bank achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Steal the Botanical Bank
Take all the photos
Puchased all the Robo-Roids
Steal $1,000,000 total
Find dad's stuff
Find the Mysterious Motherlode
Defeat Uncle Rigsby
Defeat Mecha-Chad
Steal $100,000 total
Defeat the Rotten Candy Apple
Defeat Yeehaw
Steal $10,000 total
Purchase a Robo-Roid
Use the weapon rack
Purchase an item off the dark web
Research a weapon
Steal $1,000 total
Break into the Botanical Bank
Defeat the final boss
Obtained all the hats
Purchased all the items from the dark web
Reached the max level in weapon research
Complete all tasks