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 330 bullets
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Shoot 266 bullets
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Shoot 244 bullets
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Shoot 224 bullet
Shoot 255 bullet
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Shoot 196 bullets
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Shoot 175 bullets
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Shoot 148 bullets
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Shoot 132 bullets
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Shoot 112 bullets
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Shoot 118 bullets
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Shoot 106 bullets
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Shoot 48 bullets
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Shoot 2 bullets
Shoot 1 bullet