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 425 bullets
Shoot 426 bullets
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Shoot 418 bullets
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Shoot 396 bullets
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Shoot 365 bullets
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Shoot 343 bullets
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Shoot 338 bullets
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Shoot 314 bullets
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Shoot 296 bullets
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Shoot 291 bullets
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Shoot 285 bullets
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Shoot 278 bullets
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Shoot 273 bullets
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Shoot 266 bullets
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Shoot 262 bullets
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Shoot 255 bullets
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Shoot 237 bullets
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Shoot 227 bullets
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Shoot 204 bullets
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Shoot 197 bullets
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Shoot 190 bullets
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Shoot 174 bullets
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Shoot 166 bullets
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Shoot 133 bullets
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Shoot 128 bullets
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Shoot 116 bullets
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Shoot 108 bullets
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Shoot 103 bullets
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Shoot 96 bullets
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Shoot 1 bullet
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Shoot 4 bullets