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 423 bullets
Shoot 424 bullets
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Shoot 294 bullets
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Shoot 278 bullets
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Shoot 273 bullets
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Shoot 269 bullets
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Shoot 264 bullets
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Shoot 196 bullets
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Shoot 108 bullets
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Shoot 104 bullets
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Shoot 99 bullets
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Shoot 93 bullets
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Shoot 84 bullets
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Shoot 1 bullet
Shoot 2 bullets