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 426 bullets
Shoot 427 bullets
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Shoot 308 bullets
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Shoot 295 bullets
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Shoot 286 bullets
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Shoot 276 bullets
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Shoot 272 bullets
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Shoot 266 bullets
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Shoot 114 bullets
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Shoot 1 bullet
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