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 366 bullets
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Shoot 286 bullets
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Shoot 270 bullets
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Shoot 267 bullets
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Shoot 255 bullets
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Shoot 115 bullets
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Shoot 111 bullets
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Shoot 107 bullets
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Shoot 96 bullets
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Shoot 1 bullet