Here is the full list of all 33 Ninjin: Clash of Carrots achievements.
Reach a combo of 100.
Collect 15 projectile items.
Spend 1000 rainbow carrots at the shop.
Defeat the Ice Troll in World 2.
Collect 30 swords.
Spend 20000 carrots at the shop.
Collect 10 accessories.
Collect 10 artifacts.
Beat a stage without dashing.
Defeat General Jam in World 1.
Equip an accessory.
Play in the Oni TV Show.
Defeat 100 enemies.
Clear stage 1-1.
Play a stage in co-op mode.
Defeat the Summoner in World 3.
Venture into the Summoner's dark world.
Defeat the final boss Sum-Moe-Ner and clear the game.
Get an S-rank medal in a stage.
Get an S-rank medal in every stage.
Collect all swords.
Collect all projectile items.
Collect all artifacts.
Collect all accessories.
Beat stages using a sword of every class.
Reach wave 50 in the Oni TV Show.
Make Corgi Jr. dizzy in the shop.
Reach a combo of 500.
Cheat in Moe Jr.'s challenge in stage 4-4.
Clear wave 6 in stage 1-4 without taking damage.
Beat a stage without using swords.
Beat a stage without using projectiles.
Defeat 3000 enemies.