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 387 bullets
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Shoot 268 bullets
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Shoot 223 bullet
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Shoot 255 bullet
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Shoot 196 bullets
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Shoot 174 bullets
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Shoot 136 bullets
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Shoot 112 bullets
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Shoot 1 bullet