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 387 bullets
Shoot 388 bullets
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Shoot 332 bullets
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Shoot 328 bullets
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Shoot 308 bullets
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Shoot 269 bullets
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Shoot 261 bullets
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Shoot 253 bullets
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Shoot 238 bullet
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Shoot 255 bullet
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Shoot 186 bullets
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Shoot 176 bullets
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Shoot 175 bullets
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Shoot 154 bullets
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Shoot 147 bullets
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Shoot 153 bullets
Shoot 136 bullets
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Shoot 146 bullets
Shoot 133 bullets
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Shoot 112 bullets
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Shoot 49 bullets
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Shoot 37 bullets
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Shoot 1 bullet
Shoot 2 bullets