Exercises
1. Implement a system of storing and resubmitting achievements if the Game Center servers are unreachable. Look at the approach used for leaderboards in Chapter 3 for guidance. Be sure to keep only the highest percentages complete in the offline cache.
2. Add a new achievement for hitting five cacti within one second. You will need to create some timers that track sequential hits. You can use the existing achievement identifier com.dragonforged.whackacac.hit5Fast.
3. Implement a custom display for your achievement progress using the information from the section “Going Further with Achievements” as a guide.
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