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 298 bullets
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Shoot 294 bullets
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Shoot 288 bullets
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Shoot 293 bullets
Shoot 284 bullets
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Shoot 280 bullets
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Shoot 276 bullets
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Shoot 267 bullets
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Shoot 257 bullets
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Shoot 110 bullets
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Shoot 105 bullets
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Shoot 1 bullet