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 421 bullets
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Shoot 341 bullets
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Shoot 294 bullets
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Shoot 293 bullets
Shoot 281 bullets
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Shoot 278 bullets
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Shoot 268 bullets
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Shoot 266 bullets
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Shoot 108 bullets
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Shoot 1 bullet