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 396 bullets
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Shoot 377 bullets
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Shoot 371 bullets
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Shoot 346 bullets
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Shoot 342 bullets
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Shoot 337 bullets
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Shoot 309 bullets
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Shoot 308 bullets
Shoot 300 bullets
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Shoot 293 bullets
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Shoot 284 bullets
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Shoot 279 bullets
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Shoot 274 bullets
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Shoot 278 bullets
Shoot 269 bullets
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Shoot 265 bullets
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Shoot 254 bullets
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Shoot 239 bullets
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Shoot 226 bullets
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Shoot 217 bullets
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Shoot 204 bullets
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Shoot 194 bullets
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Shoot 185 bullets
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Shoot 176 bullets
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Shoot 180 bullets
Shoot 166 bullets
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Shoot 136 bullets
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Shoot 119 bullets
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Shoot 116 bullets
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Shoot 118 bullets
Shoot 111 bullets
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Shoot 107 bullets
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Shoot 99 bullets
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Shoot 96 bullets
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Shoot 89 bullets
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Shoot 49 bullets
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Shoot 1 bullet
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Shoot 4 bullets