Here is the full list of all 428 Sleengster achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 424 bullets
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Shoot 366 bullets
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Shoot 346 bullets
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Shoot 295 bullets
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Shoot 289 bullets
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Shoot 282 bullets
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Shoot 276 bullets
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Shoot 269 bullets
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Shoot 226 bullets
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Shoot 111 bullets
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Shoot 97 bullets
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Shoot 1 bullet