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 380 bullets
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Shoot 374 bullets
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Shoot 295 bullets
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Shoot 289 bullets
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Shoot 282 bullets
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Shoot 276 bullets
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Shoot 268 bullets
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Shoot 264 bullets
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Shoot 189 bullets
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Shoot 115 bullets
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Shoot 114 bullets
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Shoot 1 bullet