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 296 bullets
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Shoot 292 bullets
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Shoot 288 bullets
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Shoot 279 bullets
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Shoot 275 bullets
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Shoot 258 bullets
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Shoot 116 bullets
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Shoot 113 bullets
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Shoot 109 bullets
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Shoot 105 bullets
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Shoot 1 bullet
Shoot 2 bullets