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
Shoot 388 bullets
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Shoot 330 bullets
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Shoot 277 bullets
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Shoot 273 bullets
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Shoot 270 bullets
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Shoot 264 bullets
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Shoot 238 bullet
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Shoot 255 bullet
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Shoot 194 bullets
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Shoot 184 bullets
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Shoot 177 bullets
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Shoot 169 bullets
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Shoot 154 bullets
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Shoot 147 bullets
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Shoot 45 bullets
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Shoot 39 bullets
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Shoot 34 bullets
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Shoot 2 bullets
Shoot 1 bullet