Here is the full list of all 50 Pewt 'em Up! achievements.
Unlock all achievements.
Collect 5k quartz fragments.
Beat stage mode twice.
Beat the game in Ace Mode.
Clear a stage without shooting once.
Buy all available upgrades in the shop.
Buy all Recharger upgrades in the shop.
Buy all Items in the shop.
Buy all Shield upgrades in the shop.
Level up Egg-kun.
Hatch the egg.
Collect 50k credits.
Buy all Ship Parts upgrades in the shop.
Destroy 250 asteroids or enemy ships by ramming them.
Enter the sacred code in the main menu.
Watch the post-credit scene.
Watch the credits until the end.
Beat the game in Cadet Mode.
Beat the game in Rookie or Cadet Mode.
Defeat Varik Gorr.
Buy all Reloader upgrades in the shop.
Unlock the Silver Wing.
Destroy 100 asteroids or enemy ships by ramming them.
Buy all Armor upgrades in the shop.
Buy all Weapon upgrades in the shop.
Collect 10k credits.
Achieve a score of at least 1M in endless mode.
Destroy 500 enemy ships.
Achieve a score of at least 250k in endless mode.
Collect 1k quartz fragments.
Achieve a score of at least 100k in endless mode.
Unlock the Valkyrie Type MA.
Destroy 1k enemy drones.
Destroy 10k asteroids.
Destroy a battleship without the Silver Wing.
Collect 1k credits.
Destroy 10 asteroids or enemy ships by ramming them.
Clear a stage without being hit once.
Destroy 100 enemy ships.
Destroy a divider ship.
Destroy 100 enemy drones.
Self-destruct your ship by using the bomb.
Achieve a score of at least 9001 in endless mode.
Destroy 1k asteroids.
Destroy a bumper ship.
Destroy 10 enemy ships.
Destroy 100 asteroids.
Destroy 10 enemy drones.
Use the bomb for the first time.
Collect your first quartz fragment.