Here is the full list of all 500 Crazy Alien achievements.
You saved 500 animals
You saved 499 animals
You saved 498 animals
You saved 497 animals
You saved 496 animals
You saved 495 animals
You saved 494 animals
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You saved 399 animals
You saved 398 animals
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You saved 396 animals
You saved 395 animals
You saved 394 animals
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You saved 392 animals
You saved 391 animals
You saved 390 animals
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You saved 388 animals
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You saved 378 animals
You saved 377 animals
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You saved 369 animals
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You saved 366 animals
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You saved 350 animals
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You saved 312 animals
You saved 311 animals
You saved 310 animals
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You saved 308 animals
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You saved 306 animals
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You saved 303 animals
You saved 304 animals
You saved 302 animals
You saved 301 animals
You saved 300 animals
You saved 299 animals
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You saved 281 animals
You saved 280 animals
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You saved 278 animals
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You saved 273 animals
You saved 272 animals
You saved 271 animals
You saved 270 animals
You saved 269 animals
You saved 268 animals
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You saved 267 animals
You saved 265 animals
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You saved 183 animals
You saved 182 animals
You saved 180 animals
You saved 181 animals
You saved 179 animals
You saved 178 animals
You saved 177 animals
You saved 176 animals
You saved 175 animals
You saved 174 animals
You saved 173 animals
You saved 172 animals
You saved 171 animals
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You saved 170 animals
You saved 168 animals
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You saved 165 animals
You saved 164 animals
You saved 163 animals
You saved 162 animals
You saved 160 animals
You saved 161 animals
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You saved 156 animals
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You saved 138 animals
You saved 137 animals
You saved 136 animals
You saved 135 animals
You saved 134 animals
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You saved 132 animals
You saved 131 animals
You saved 130 animals
You saved 129 animals
You saved 128 animals
You saved 127 animals
You saved 126 animals
You saved 125 animals
You saved 124 animals
You saved 123 animals
You saved 122 animals
You saved 121 animals
You saved 120 animals
You saved 119 animals
You saved 118 animals
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You saved 115 animals
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You saved 101 animals
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You saved 100 animals
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You saved 92 animals
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You saved 90 animals
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You saved 12 animals
You saved 10 animals
You saved 11 animals
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You saved 7 animals
You saved 6 animals
You saved 5 animals
You saved 4 animals
You saved 3 animals
You saved 2 animals
You saved the animal