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 427 bullets
Shoot 428 bullets
Shoot 423 bullets
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Shoot 418 bullets
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Shoot 398 bullets
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Shoot 394 bullets
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Shoot 386 bullets
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Shoot 372 bullets
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Shoot 367 bullets
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Shoot 364 bullets
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Shoot 355 bullets
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Shoot 346 bullets
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Shoot 341 bullets
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Shoot 309 bullets
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Shoot 299 bullets
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Shoot 295 bullets
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Shoot 288 bullets
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Shoot 293 bullets
Shoot 294 bullets
Shoot 285 bullets
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Shoot 281 bullets
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Shoot 276 bullets
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Shoot 278 bullets
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Shoot 280 bullets
Shoot 272 bullets
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Shoot 275 bullets
Shoot 267 bullets
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Shoot 264 bullets
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Shoot 175 bullets
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Shoot 136 bullets
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Shoot 116 bullets
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Shoot 119 bullets
Shoot 113 bullets
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Shoot 109 bullets
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Shoot 105 bullets
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Shoot 94 bullets
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Shoot 4 bullets
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Shoot 2 bullets
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Shoot 1 bullet