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 383 bullets
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Shoot 332 bullets
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Shoot 328 bullets
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Shoot 277 bullets
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Shoot 268 bullets
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Shoot 255 bullets
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Shoot 255 bullet
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Shoot 194 bullets
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Shoot 177 bullets
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Shoot 136 bullets
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Shoot 48 bullets
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Shoot 1 bullet
Shoot 2 bullets