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 383 bullets
Shoot 384 bullets
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Shoot 329 bullets
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Shoot 345 bullets
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Shoot 323 bullets
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Shoot 272 bullets
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Shoot 261 bullets
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Shoot 251 bullets
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Shoot 244 bullets
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Shoot 255 bullet
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Shoot 177 bullets
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Shoot 137 bullets
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Shoot 46 bullets
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Shoot 37 bullets
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Shoot 1 bullet