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 376 bullets
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Shoot 224 bullet
Shoot 255 bullet
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Shoot 223 bullet
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Shoot 188 bullets
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Shoot 167 bullets
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Shoot 134 bullets
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Shoot 1 bullet