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 373 bullets
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Shoot 364 bullets
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Shoot 338 bullets
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Shoot 314 bullets
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Shoot 310 bullets
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Shoot 306 bullets
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Shoot 298 bullets
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Shoot 302 bullets
Shoot 295 bullets
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Shoot 287 bullets
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Shoot 282 bullets
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Shoot 278 bullets
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Shoot 274 bullets
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Shoot 277 bullets
Shoot 269 bullets
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Shoot 264 bullets
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Shoot 256 bullets
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Shoot 248 bullets
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Shoot 239 bullets
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Shoot 223 bullets
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Shoot 206 bullets
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Shoot 198 bullets
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Shoot 193 bullets
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Shoot 185 bullets
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Shoot 177 bullets
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Shoot 115 bullets
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Shoot 111 bullets
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Shoot 106 bullets
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Shoot 93 bullets
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Shoot 89 bullets
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Shoot 84 bullets
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Shoot 38 bullets
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Shoot 6 bullets
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Shoot 1 bullet