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 131 bullets
Shoot 133 bullets
Shoot 134 bullets
Shoot 135 bullets
Shoot 129 bullets
Shoot 130 bullets
Shoot 428 bullets
Shoot 423 bullets
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Shoot 397 bullets
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Shoot 388 bullets
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Shoot 396 bullets
Shoot 376 bullets
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Shoot 365 bullets
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Shoot 353 bullets
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Shoot 341 bullets
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Shoot 319 bullets
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Shoot 307 bullets
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Shoot 295 bullets
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Shoot 306 bullets
Shoot 287 bullets
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Shoot 293 bullets
Shoot 294 bullets
Shoot 276 bullets
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Shoot 286 bullets
Shoot 264 bullets
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Shoot 253 bullets
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Shoot 199 bullets
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Shoot 195 bullets
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Shoot 185 bullets
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Shoot 175 bullets
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Shoot 171 bullets
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Shoot 165 bullets
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Shoot 136 bullets
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Shoot 111 bullets
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Shoot 110 bullets
Shoot 90 bullets
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Shoot 80 bullets
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Shoot 68 bullets
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Shoot 49 bullets
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Shoot 46 bullets
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Shoot 37 bullets
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Shoot 8 bullets
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Shoot 1 bullet
Shoot 2 bullets