Here is the full list of all 44 Pronty achievements.
Complete the New Recruit quest.
Defeat Para-Keto.
Defeat Lamina.
Defeat Giant Brick Lair.
Defeat Puffy Fortress.
Defeat Meduso Magna.
Defeat Electric Hydra.
Defeat Decaying Majesty.
Defeat Raksha.
Defeat Hellish Rabbitus.
Defeat Garbage Maiden.
Defeat Handbelina.
Defeat Mimic.
Defeat Golden Chatterteeth.
Defeat Ningen.
Open the sealed mine gate.
Unlock the normal ending.
Unlock the redemption ending.
Unlock the hidden ending.
Collect every Memory Board.
Learn Skill: Minimorphus.
Learn Skill: Whirlpool.
Learn Skill: Thunderpass.
Learn Skill: Dark Portal.
Learn every skill.
Collect every item successfully.
Explore every map in the game successfully.
Collect every Encyclopedia entry.
View all CG scenes.
Collect every GRT-112.
Collect every EXC-358.
Reach 100% game completion.
Obtain all Beginner Arena rewards.
Obtain all Intermediate Arena rewards.
Obtain all Expert Arena rewards.
Obtain all Fish Racetrack rewards.
Obtain all Plaza de Toros rewards.
Find every meme decoration.
View the city using the telescope.
Light the underground Christmas tree successfully and get a Christmas present.
Open the elevator in the hall of Royla Tower.
Do your best to make a basket with the basketball!
Kill Boba Tea Fish for the first time.
Complete the Boss Rush.