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 366 bullets
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Shoot 359 bullets
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Shoot 338 bullets
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Shoot 308 bullets
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Shoot 296 bullets
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Shoot 292 bullets
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Shoot 286 bullets
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Shoot 282 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 255 bullets
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Shoot 176 bullets
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Shoot 113 bullets
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Shoot 104 bullets
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Shoot 91 bullets
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Shoot 1 bullet