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 426 bullets
Shoot 427 bullets
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Shoot 365 bullets
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Shoot 295 bullets
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Shoot 288 bullets
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Shoot 280 bullets
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Shoot 279 bullets
Shoot 272 bullets
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Shoot 267 bullets
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Shoot 114 bullets
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Shoot 109 bullets
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Shoot 95 bullets
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Shoot 1 bullet