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 425 bullets
Shoot 426 bullets
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Shoot 377 bullets
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Shoot 367 bullets
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Shoot 349 bullets
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Shoot 348 bullets
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Shoot 312 bullets
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Shoot 309 bullets
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Shoot 300 bullets
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Shoot 291 bullets
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Shoot 284 bullets
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Shoot 278 bullets
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Shoot 275 bullets
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Shoot 277 bullets
Shoot 240 bullets
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Shoot 274 bullets
Shoot 239 bullets
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Shoot 115 bullets
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Shoot 112 bullets
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Shoot 104 bullets
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Shoot 83 bullets
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Shoot 46 bullets
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Shoot 2 bullets
Shoot 1 bullet