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 334 bullets
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Shoot 319 bullets
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Shoot 310 bullets
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Shoot 296 bullets
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Shoot 287 bullets
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Shoot 280 bullets
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Shoot 275 bullets
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Shoot 267 bullets
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Shoot 274 bullets
Shoot 260 bullets
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Shoot 252 bullets
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Shoot 244 bullets
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Shoot 243 bullet
Shoot 250 bullets
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Shoot 237 bullet
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Shoot 219 bullet
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Shoot 255 bullet
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Shoot 205 bullet
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Shoot 191 bullets
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Shoot 176 bullets
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Shoot 169 bullets
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Shoot 154 bullets
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Shoot 145 bullets
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Shoot 139 bullets
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Shoot 133 bullets
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Shoot 132 bullets
Shoot 112 bullets
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Shoot 116 bullets
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Shoot 106 bullets
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Shoot 97 bullets
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Shoot 92 bullets
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Shoot 78 bullets
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Shoot 71 bullets
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Shoot 63 bullets
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Shoot 55 bullets
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Shoot 46 bullets
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Shoot 37 bullets
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Shoot 32 bullets
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Shoot 2 bullets
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Shoot 1 bullet