Here is the full list of all 428 Sleengster achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 424 bullets
Shoot 425 bullets
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Shoot 296 bullets
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Shoot 286 bullets
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Shoot 277 bullets
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Shoot 272 bullets
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Shoot 268 bullets
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Shoot 258 bullets
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Shoot 113 bullets
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Shoot 109 bullets
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Shoot 104 bullets
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Shoot 96 bullets
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Shoot 1 bullet