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 394 bullets
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Shoot 374 bullets
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Shoot 363 bullets
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Shoot 349 bullets
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Shoot 341 bullets
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Shoot 316 bullets
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Shoot 312 bullets
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Shoot 297 bullets
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Shoot 302 bullets
Shoot 293 bullets
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Shoot 288 bullets
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Shoot 283 bullets
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Shoot 278 bullets
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Shoot 277 bullets
Shoot 275 bullets
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Shoot 270 bullets
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Shoot 259 bullets
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Shoot 264 bullets
Shoot 255 bullets
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Shoot 236 bullets
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Shoot 226 bullets
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Shoot 217 bullets
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Shoot 212 bullets
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Shoot 197 bullets
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Shoot 194 bullets
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Shoot 187 bullets
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Shoot 177 bullets
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Shoot 116 bullets
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Shoot 113 bullets
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Shoot 105 bullets
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Shoot 96 bullets
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Shoot 91 bullets
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Shoot 40 bullets
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Shoot 6 bullets
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Shoot 2 bullets
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Shoot 1 bullet