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 294 bullets
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Shoot 269 bullets
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Shoot 258 bullets
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Shoot 196 bullets
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Shoot 108 bullets
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Shoot 106 bullets
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Shoot 93 bullets
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Shoot 1 bullet