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 380 bullets
Shoot 381 bullets
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Shoot 334 bullets
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Shoot 328 bullets
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Shoot 296 bullets
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Shoot 271 bullets
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Shoot 264 bullets
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Shoot 258 bullets
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Shoot 244 bullets
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Shoot 255 bullet
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Shoot 164 bullet
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Shoot 157 bullet
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Shoot 149 bullets
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Shoot 144 bullets
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Shoot 137 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 94 bullets
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Shoot 45 bullets
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Shoot 39 bullets
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Shoot 2 bullets
Shoot 1 bullet