NOTE: More coming soon!

Credits Ending
This is the easiest of all the endings to get, of course that's why it's not that great. All you have to do is beat the game the first time around.

Save Schala Ending
This is the hardest of all the endings to obtain. To do it you must have combined the Tear of Love and the Tear of Hate to get the Chrono Cross Element. When you are fighting the 2nd Time Devourer you must use the 7 Elements in this order: Yellow, Red, Green, Blue, Black, White, Chrono Cross. What makes this so hard is that the Time Devourer only lets you use 5 Elements in a row, so you'll have to time it so either he uses the Yellow Element and then you start from there, or you start and hope he uses a White Element at the right time. Immediately after you use the Chrono Cross the battle will end. If you're thinking "How in the heck would anyone know the order to use those Elements in?" then here's a simple answer: If you go to Earth Dragon Isle in Another World after you have beaten the 1st Time Devourer, jump in the hole and go to where the Earth Dragon would have been and you'll fight a monster called Crioshinx. He'll tell you some riddles in old english and if you answer correctly by using the right color Element on him, he'll ask you the next question. If you get one wrong he'll do Earthquake to you. The order of the riddles is the order of the Elements you have to use on the 2nd Time Devourer. Also if you do fight him remember you can steal a @Rainbow Shell from him!

Note: I know all of these work because I've tried them myself.