The Berry Good Rewards tiers are Macaw, Sloth, and Jaguar. These tiers are based on the dollar amount you have spent in the last 365 days. To achieve Macaw Tier, you need to spend $0-$125, Sloth Tier is $126-$300, and to reach Jaguar Tier, you must spend $300 or more. As you advance to higher tiers, you'll unlock access to even more benefits.
See the Rewards Page for more information on the benefits of each tier.