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 374 bullets
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Shoot 365 bullets
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Shoot 349 bullets
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Shoot 344 bullets
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Shoot 339 bullets
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Shoot 335 bullets
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Shoot 327 bullets
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Shoot 308 bullets
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Shoot 295 bullets
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Shoot 283 bullets
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Shoot 279 bullets
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Shoot 278 bullets
Shoot 273 bullets
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Shoot 267 bullets
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Shoot 261 bullets
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Shoot 257 bullets
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Shoot 237 bullets
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Shoot 197 bullets
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Shoot 187 bullets
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Shoot 136 bullets
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Shoot 116 bullets
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Shoot 120 bullets
Shoot 112 bullets
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Shoot 109 bullets
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Shoot 111 bullets
Shoot 104 bullets
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Shoot 99 bullets
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Shoot 94 bullets
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Shoot 49 bullets
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Shoot 46 bullets
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Shoot 1 bullet
Shoot 2 bullets