To get anchors you need to complete tasks and win levels in the Ship. There are a few important rules:

1 – If you win anchors but the level is failed, they can't be credited. Keep in mind that you need both to complete tasks and win the level. 

2 – Each anchor has its own task. If you complete the same task repeatedly, anchor will not be added to the total number of anchors for this level. You can win each anchor only once.

3 – Each land has its own count of anchors (0/30 or 0/45 or 0/60). If you win anchors on one land, it won't be registered in the counter of other lands. Use a switcher at the bottom to check the amount of anchors you collected in each  land. 

Please follow these rules to earn anchors faster. Good luck!