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 422 bullets
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Shoot 388 bullets
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Shoot 384 bullets
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Shoot 377 bullets
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Shoot 367 bullets
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Shoot 359 bullets
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Shoot 353 bullets
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Shoot 347 bullets
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Shoot 308 bullets
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Shoot 298 bullets
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Shoot 294 bullets
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Shoot 282 bullets
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Shoot 278 bullets
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Shoot 275 bullets
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Shoot 271 bullets
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Shoot 267 bullets
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Shoot 255 bullets
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Shoot 206 bullets
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Shoot 196 bullets
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Shoot 194 bullets
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Shoot 187 bullets
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Shoot 117 bullets
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Shoot 113 bullets
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Shoot 105 bullets
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Shoot 84 bullets
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Shoot 46 bullets
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Shoot 1 bullet
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Shoot 4 bullets