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 411 bullets
Shoot 412 bullets
Shoot 406 bullets
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Shoot 369 bullets
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Shoot 357 bullets
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Shoot 349 bullets
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Shoot 347 bullets
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Shoot 428 bullets
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Shoot 299 bullets
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Shoot 293 bullets
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Shoot 280 bullets
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Shoot 275 bullets
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Shoot 271 bullets
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Shoot 268 bullets
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Shoot 264 bullets
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Shoot 258 bullets
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Shoot 255 bullets
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Shoot 228 bullets
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Shoot 124 bullets
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Shoot 119 bullets
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Shoot 117 bullets
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Shoot 113 bullets
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Shoot 116 bullets
Shoot 107 bullets
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Shoot 102 bullets
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Shoot 93 bullets
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Shoot 84 bullets
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Shoot 47 bullets
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Shoot 34 bullets
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Shoot 7 bullets
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Shoot 2 bullets
Shoot 1 bullet