Survival Mode will be the longest part for your full 1,000. You have to fight a set number of enemies ranging from 2-11 and survive every outcome without losing once. You're awarded health after every fight depending on how well you did. You can play on any difficulty in order to unlock these.
You can also use the glitch:
Step 1: Go to Free battle > vs battle > 1 vs cpu.
Step 2: set the handicap all the way up and change difficulty to super easy(not sure if difficulty matters) chose your character you want to use in tournament/survivor.
Step 3: Win your match then select the Free Battle menu.
Step 4: Now Select Tournament/survivor and there you go you take less damage and enemy takes 2x more damage then usual.
Credit goes to porkchop547