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 389 bullets
Shoot 370 bullets
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Shoot 299 bullets
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Shoot 268 bullets
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Shoot 263 bullets
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Shoot 244 bullets
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Shoot 255 bullet
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Shoot 195 bullets
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Shoot 179 bullets
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Shoot 165 bullet
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Shoot 146 bullets
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Shoot 131 bullets
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Shoot 112 bullets
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Shoot 35 bullets
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Shoot 1 bullet