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 349 bullets
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Shoot 329 bullets
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Shoot 305 bullets
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Shoot 275 bullets
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Shoot 270 bullets
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Shoot 264 bullets
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Shoot 259 bullets
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Shoot 244 bullets
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Shoot 239 bullet
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Shoot 223 bullet
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Shoot 255 bullet
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Shoot 198 bullets
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Shoot 174 bullets
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Shoot 159 bullet
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Shoot 154 bullets
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Shoot 133 bullets
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Shoot 1 bullet