Here is the full list of all 374 Sleengster 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 389 bullets
Shoot 382 bullets
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Shoot 331 bullets
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Shoot 323 bullets
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Shoot 272 bullets
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Shoot 267 bullets
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Shoot 255 bullet
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Shoot 153 bullets
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Shoot 135 bullets
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Shoot 112 bullets
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Shoot 47 bullets
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Shoot 37 bullets
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Shoot 1 bullet
Shoot 2 bullets