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 366 bullets
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Shoot 349 bullets
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Shoot 335 bullets
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Shoot 297 bullets
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Shoot 281 bullets
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Shoot 278 bullets
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Shoot 280 bullets
Shoot 275 bullets
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Shoot 273 bullets
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Shoot 268 bullets
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Shoot 225 bullets
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Shoot 211 bullets
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Shoot 206 bullets
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Shoot 177 bullets
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Shoot 137 bullets
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Shoot 116 bullets
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Shoot 111 bullets
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Shoot 106 bullets
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Shoot 97 bullets
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Shoot 91 bullets
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Shoot 84 bullets
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Shoot 37 bullets
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Shoot 2 bullets
Shoot 1 bullet