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 421 bullets
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Shoot 396 bullets
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Shoot 392 bullets
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Shoot 388 bullets
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Shoot 379 bullets
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Shoot 372 bullets
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Shoot 359 bullets
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Shoot 355 bullets
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Shoot 344 bullets
Shoot 166 bullets
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Shoot 143 bullets
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Shoot 150 bullets
Shoot 136 bullets
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Shoot 129 bullets
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Shoot 135 bullets
Shoot 340 bullets
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Shoot 334 bullets
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Shoot 329 bullets
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Shoot 312 bullets
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Shoot 306 bullets
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Shoot 305 bullets
Shoot 296 bullets
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Shoot 287 bullets
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Shoot 282 bullets
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Shoot 276 bullets
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Shoot 272 bullets
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Shoot 265 bullets
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Shoot 236 bullets
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Shoot 178 bullets
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Shoot 174 bullets
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Shoot 124 bullets
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Shoot 115 bullets
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Shoot 98 bullets
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Shoot 91 bullets
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Shoot 47 bullets
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Shoot 6 bullets
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Shoot 2 bullets
Shoot 1 bullet