you can't change an Axolotl into a Salamander. It is possible for an Axolotl to become land-dwelling, but it's still an Axolotl, which is different than a salamander. (however slight)
basically it's just a metamorphasized [sp] axie... either way it's not really suggested... they tend to undergo (or attempt to undergo) metamorphasis when something's wrong... hideous water quality being a big one... but, from what i've heard on the axie forum (as well as a zillion different websits) they're more likely to die than to successfully complete the change.