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 333 bullets
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Shoot 323 bullets
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Shoot 308 bullets
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Shoot 298 bullets
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Shoot 288 bullets
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Shoot 277 bullets
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Shoot 266 bullets
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Shoot 262 bullets
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Shoot 248 bullets
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Shoot 237 bullet
Shoot 255 bullet
Shoot 226 bullet
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Shoot 196 bullets
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Shoot 174 bullets
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Shoot 159 bullet
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Shoot 153 bullets
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Shoot 147 bullets
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Shoot 136 bullets
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Shoot 112 bullets
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Shoot 106 bullets
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Shoot 87 bullets
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Shoot 47 bullets
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Shoot 41 bullets
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Shoot 35 bullets
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Shoot 1 bullet