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 386 bullets
Shoot 387 bullets
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Shoot 345 bullets
Shoot 330 bullets
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Shoot 321 bullets
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Shoot 295 bullets
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Shoot 292 bullets
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Shoot 294 bullets
Shoot 258 bullets
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Shoot 248 bullets
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Shoot 256 bullets
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Shoot 224 bullet
Shoot 255 bullet
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Shoot 215 bullet
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Shoot 192 bullets
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Shoot 183 bullets
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Shoot 174 bullets
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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 140 bullets
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Shoot 148 bullets
Shoot 137 bullets
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Shoot 112 bullets
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Shoot 108 bullets
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Shoot 94 bullets
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Shoot 45 bullets
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Shoot 40 bullets
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Shoot 34 bullets
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Shoot 3 bullets
Shoot 2 bullets
Shoot 1 bullet