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 388 bullets
Shoot 389 bullets
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Shoot 333 bullets
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Shoot 327 bullets
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Shoot 286 bullets
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Shoot 266 bullets
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Shoot 249 bullets
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Shoot 255 bullet
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Shoot 193 bullets
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Shoot 175 bullets
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Shoot 165 bullet
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Shoot 137 bullets
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Shoot 37 bullets
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Shoot 1 bullet