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 367 bullets
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Shoot 355 bullets
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Shoot 335 bullets
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Shoot 299 bullets
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Shoot 297 bullets
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Shoot 288 bullets
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Shoot 284 bullets
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Shoot 280 bullets
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Shoot 278 bullets
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Shoot 274 bullets
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Shoot 266 bullets
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Shoot 229 bullets
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Shoot 196 bullets
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Shoot 118 bullets
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Shoot 113 bullets
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Shoot 110 bullets
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Shoot 105 bullets
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Shoot 100 bullets
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Shoot 94 bullets
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Shoot 2 bullets
Shoot 1 bullet