Objective

Objective return in PvZAMJ. Although it is not compulsory, it is needed to be completed in order to earn stars. Below is list of all objective:
 * Defeat X zombies in Y seconds
 * Don't lose more than X plants
 * Don't spend any sun for X seconds
 * Never have more than X plants
 * Produce at least X sun
 * Spend no more than X sun
 * Don't lose any lawn mowers
 * Don't use Plant Foods
 * Beat the level in X minutes/seconds
 * Don't use a plant in Z tribe
 * Only use Level 1 plants
 * Have X graves at the end of the level