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
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Shoot 376 bullets
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Shoot 366 bullets
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Shoot 296 bullets
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Shoot 278 bullets
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Shoot 272 bullets
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Shoot 267 bullets
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Shoot 194 bullets
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Shoot 185 bullets
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Shoot 176 bullets
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Shoot 115 bullets
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Shoot 109 bullets
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Shoot 97 bullets
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Shoot 1 bullet
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