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 346 bullets
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Shoot 331 bullets
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Shoot 345 bullets
Shoot 327 bullets
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Shoot 299 bullets
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Shoot 288 bullets
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Shoot 275 bullets
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Shoot 266 bullets
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Shoot 262 bullets
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Shoot 247 bullets
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Shoot 244 bullets
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Shoot 239 bullet
Shoot 223 bullet
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Shoot 255 bullet
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Shoot 217 bullet
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Shoot 206 bullet
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Shoot 196 bullets
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Shoot 177 bullets
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Shoot 171 bullets
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Shoot 166 bullet
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Shoot 136 bullets
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Shoot 117 bullets
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Shoot 87 bullets
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Shoot 70 bullets
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Shoot 50 bullets
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Shoot 44 bullets
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Shoot 2 bullets
Shoot 1 bullet