| Achievement | How to unlock
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| 1,000 stars | Collect 1,000 stars.
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| 100% Easy | Complete the game on easy difficulty or higher.
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| 100% Hardcore | Complete the game on hardcore difficulty.
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| 100% Normal | Complete the game on normal difficulty or higher.
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| 15,000 stars | Collect 15,000 stars.
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| 8,000 stars | Collect 8,000 stars.
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| Arcade 10 | Complete 10 arcade levels.
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| Arcade 20 | Complete all 20 arcade levels.
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| Arcade 5 | Complete 5 arcade levels.
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| Arcade mastery | Complete all arcade levels with 3-star rank.
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| Bomber | Kill 25 enemies using bombs.
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| Challenge 10 | Beat 10 challenge levels.
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| Challenge 22 | Beat 22 challenge levels.
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| Challenge 44 | Beat all 44 challenge levels.
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| Challenge mastery | Complete all challenges with 3-star rank.
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| Collector | Score total of 100,000 points in story mode.
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| Counterproductive | Complete an arcade level with 0-star rank.
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| Deadly punch | Punch 100 enemies.
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| Death from above | Kill 10 enemies using a falling rock.
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| Explorer | Find 10 secret stars.
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| Final boss defeated | Beat the final boss.
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| First boss defeated | Beat the first boss.
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| It wasn't in the tutorial! | Kill a hedgehog.
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| Living bullet | Kill 10 enemies using another enemy.
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| Multi kill | Kill 5 enemies by bouncing from one to another.
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| Obsessive Collecting Disorder | Complete a story level with perfect score.
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| Pacifist | Complete a story level without killing any creature.
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| Second boss defeated | Beat the second boss.
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| Speedrunner | Complete a story level in less than 5 minutes.
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| Stomper | Kill 100 enemies using stomp.
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| Super Collector | Score total of 200,000 points in story mode.
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| Super Explorer | Find 50 secret stars.
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| Third boss defeated | Beat the third boss.
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| Ultra Explorer | Find all 100 secret stars.
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| Untouchable | Complete a story level without taking any damage.
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