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 417 bullets
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Shoot 367 bullets
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Shoot 298 bullets
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Shoot 292 bullets
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Shoot 276 bullets
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Shoot 270 bullets
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Shoot 260 bullets
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Shoot 257 bullets
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Shoot 236 bullets
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Shoot 136 bullets
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Shoot 2 bullets
Shoot 1 bullet