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 427 bullets
Shoot 428 bullets
Shoot 425 bullets
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Shoot 417 bullets
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Shoot 366 bullets
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Shoot 296 bullets
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Shoot 279 bullets
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Shoot 275 bullets
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Shoot 268 bullets
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Shoot 117 bullets
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Shoot 114 bullets
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Shoot 106 bullets
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Shoot 98 bullets
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Shoot 2 bullets
Shoot 1 bullet