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 395 bullets
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Shoot 389 bullets
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Shoot 376 bullets
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Shoot 371 bullets
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Shoot 366 bullets
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Shoot 348 bullets
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Shoot 338 bullets
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Shoot 334 bullets
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Shoot 310 bullets
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Shoot 298 bullets
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Shoot 293 bullets
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Shoot 285 bullets
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Shoot 280 bullets
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Shoot 274 bullets
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Shoot 278 bullets
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Shoot 267 bullets
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Shoot 261 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 229 bullets
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Shoot 207 bullets
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Shoot 198 bullets
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Shoot 194 bullets
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Shoot 184 bullets
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Shoot 176 bullets
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Shoot 168 bullets
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Shoot 164 bullets
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Shoot 146 bullets
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Shoot 134 bullets
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Shoot 126 bullets
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Shoot 125 bullets
Shoot 117 bullets
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Shoot 113 bullets
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Shoot 109 bullets
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Shoot 104 bullets
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Shoot 99 bullets
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Shoot 93 bullets
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Shoot 89 bullets
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Shoot 83 bullets
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Shoot 76 bullets
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Shoot 68 bullets
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Shoot 44 bullets
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Shoot 39 bullets
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Shoot 6 bullets
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Shoot 1 bullet
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Shoot 5 bullets