The Big Bad Bosses Title update for Paper Planet has 22 achievements.
Defeat an enhanced boss without breaking the Fragile Core.
That's a very large planet you've got there.
Change directions less than 10 times in a single run.
Block a hit while cursed, preventing your instant death.
Begin a boss fight while cursed with no shield cell.
Unlock and defeat every boss variant.
Defeat the Wildfire and their mech with unnecessary legs for the first time.
Defeat the Wildfire and their very safe, no-chance-of-exploding ship for the first time.
Defeat Zenith after he declared himself "King of the Cosmos", for the first time.
Defeat the Twins in their 2-in-1 ship for the first time.
Defeat Sharp in her old mining rig for the first time.
Defeat Sharp and her swarm of drones for the first time.
Defeat Violet and all of her sisters for the first time.
Defeat the very overgrown, no longer a flower, Violet, for the first time.
Defeat the Twins on their favorite moons for the first time.
Have an item you banned with the Hammer Core reroll into something else.
Use the Kingly Core to start a run with Rat Buddy.
Reroll 10 or more times with the Reroll Core in a single run.
Have 6 or more buddies at once.
When presented with items, only pick up the rightmost.
Complete the first zone without missing a single shot.
Achieve a speed stat higher than 200.