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
Shoot 385 bullets
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Shoot 379 bullets
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Shoot 359 bullets
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Shoot 332 bullets
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Shoot 345 bullets
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Shoot 330 bullets
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Shoot 323 bullets
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Shoot 307 bullets
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Shoot 297 bullets
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Shoot 288 bullets
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Shoot 280 bullets
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Shoot 276 bullets
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Shoot 272 bullets
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Shoot 275 bullets
Shoot 268 bullets
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Shoot 266 bullets
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Shoot 254 bullets
Shoot 248 bullets
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Shoot 239 bullet
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Shoot 255 bullet
Shoot 217 bullet
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Shoot 212 bullet
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Shoot 204 bullet
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Shoot 194 bullets
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Shoot 200 bullets
Shoot 189 bullets
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Shoot 185 bullets
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Shoot 179 bullets
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Shoot 174 bullets
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Shoot 153 bullets
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Shoot 133 bullets
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Shoot 128 bullets
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Shoot 112 bullets
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Shoot 118 bullets
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Shoot 111 bullets
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Shoot 95 bullets
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Shoot 54 bullets
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Shoot 49 bullets
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Shoot 45 bullets
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Shoot 39 bullets
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Shoot 37 bullets
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Shoot 2 bullets
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Shoot 1 bullet