Here's all combinations for unlock tihis achievement:
Combine Philosopher's stone and Water to make Beer.
Combine Philosopher's stone and Metal to make Gold.
Combine Philosopher's stone and Egg to make Dragon.
Combine Philosopher's stone and Poison to make Water.
Combine Philosopher's stone and Grass to make Flower.
Combine Philosopher's stone and Ghost to make Energy.
Combine Philosopher's stone and Werewolf to make Human.
Combine Philosopher's stone and Vampire to make Human.
Combine Philosopher's stone and Alcoholic to make Human.
Combine Philosopher's stone and Corpse to make Human.
Combine Philosopher's stone and Wood to make Tree.
Combine Philosopher's stone and Human to make Demigod.
Combine Philosopher's stone and Zombie to make Corpse
Master of Alchemy G5:
All reactions with Philosophers' stone discovered
This achievement is easy, if your struggling to find reactions click the link below, it will take you to a wiki showing you every combination needed to reach level two. Do all of these and the achievement will pop.