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 417 bullets
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Shoot 386 bullets
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Shoot 377 bullets
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Shoot 364 bullets
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Shoot 346 bullets
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Shoot 297 bullets
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Shoot 300 bullets
Shoot 291 bullets
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Shoot 287 bullets
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Shoot 278 bullets
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Shoot 273 bullets
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Shoot 267 bullets
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Shoot 257 bullets
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Shoot 226 bullets
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Shoot 197 bullets
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Shoot 186 bullets
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Shoot 179 bullets
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Shoot 176 bullets
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Shoot 116 bullets
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Shoot 109 bullets
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Shoot 103 bullets
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Shoot 97 bullets
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Shoot 1 bullet