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
Shoot 425 bullets
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Shoot 346 bullets
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Shoot 133 bullets
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Shoot 342 bullets
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Shoot 298 bullets
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Shoot 288 bullets
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Shoot 278 bullets
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Shoot 193 bullets
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Shoot 108 bullets
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Shoot 97 bullets
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Shoot 1 bullet
Shoot 2 bullets