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 327 bullets
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Shoot 345 bullets
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Shoot 266 bullets
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Shoot 257 bullets
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Shoot 255 bullet
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Shoot 193 bullets
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Shoot 174 bullets
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Shoot 166 bullet
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Shoot 141 bullets
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Shoot 133 bullets
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Shoot 49 bullets
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Shoot 2 bullets
Shoot 1 bullet