Tardigrades can survive extreme conditions like vacuum or radiations only when they are in their "hibernating" state, which is quasi-non-living.
The same is true for a few other kinds of animals, which can enter a special inactive state that can survive desiccation or freezing.
When living normally, no animals can resist such conditions, even if some are much more resistant to radiations than humans.
The most radiation-resistant living beings are some kinds of bacteria, e.g. Deinococcus mentioned by another poster, which have some special mechanisms for continuously repairing the DNA molecules that are damaged by radiation, which allow them to live normally while exposed to radiation.
The same is true for a few other kinds of animals, which can enter a special inactive state that can survive desiccation or freezing.
When living normally, no animals can resist such conditions, even if some are much more resistant to radiations than humans.
The most radiation-resistant living beings are some kinds of bacteria, e.g. Deinococcus mentioned by another poster, which have some special mechanisms for continuously repairing the DNA molecules that are damaged by radiation, which allow them to live normally while exposed to radiation.