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
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Shoot 385 bullets
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Shoot 377 bullets
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Shoot 336 bullets
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Shoot 297 bullets
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Shoot 294 bullets
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Shoot 286 bullets
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Shoot 277 bullets
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Shoot 276 bullets
Shoot 270 bullets
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Shoot 267 bullets
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Shoot 255 bullets
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Shoot 196 bullets
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Shoot 136 bullets
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Shoot 113 bullets
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Shoot 107 bullets
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Shoot 105 bullets
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Shoot 7 bullets
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Shoot 1 bullet
Shoot 2 bullets