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 427 bullets
Shoot 428 bullets
Shoot 423 bullets
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Shoot 418 bullets
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Shoot 349 bullets
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Shoot 342 bullets
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Shoot 293 bullets
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Shoot 282 bullets
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Shoot 271 bullets
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Shoot 263 bullets
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Shoot 254 bullets
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Shoot 244 bullets
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Shoot 194 bullets
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Shoot 184 bullets
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Shoot 174 bullets
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Shoot 167 bullets
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Shoot 108 bullets
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Shoot 92 bullets
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Shoot 2 bullets
Shoot 1 bullet