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 388 bullets
Shoot 389 bullets
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Shoot 346 bullets
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Shoot 350 bullets
Shoot 332 bullets
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Shoot 345 bullets
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Shoot 324 bullets
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Shoot 276 bullets
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Shoot 272 bullets
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Shoot 236 bullet
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Shoot 255 bullet
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Shoot 198 bullets
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Shoot 167 bullets
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Shoot 144 bullets
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Shoot 133 bullets
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Shoot 115 bullets
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Shoot 55 bullets
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Shoot 48 bullets
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Shoot 47 bullets
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Shoot 2 bullets
Shoot 1 bullet