Here is my implementation approach to all things Accountwide. Eluna needs to be set up on your server for these scripts to work and each system has a module-like configuration where you can choose to enable/disable independently.

Tired of repeating the same achievements on multiple characters? This script will allow completed achievements to be synced across all characters on the account. Once you complete an achievement, the next time you log into a different character, they will be awarded with the achievement as well. This data will be stored in a new accountwide_achievements table.

This script will allow currencies to be synced across all characters on your account. For example, if you have 100 Badge of Justice, all of your characters will have 100. If you spend 30, then all of your characters will now have 70. This data will be stored in a new accountwide_currency table.

The "currencyItemIDs" table on Line 19 of the script indicates which currencies are shared. These are the IDs pulled from CurrencyTypes.dbc. Feel free to add/remove any to tailor to your server if needed.

Gone are the days where you need to balance different amounts of gold on each of your characters.

This script essentially allows all of your characters to share a single gold fund. In other words, a joint checking/savings account. If you gain 100 gold on one character, then all of your characters will get that gold upon the next login. If you spend any gold, then all of your characters will subtract their gold balance. This data will be stored in a new accountwide_money table.

By default, this script allows learned mounts to be shared across all characters on the account, provided they are at least level 11. This level value is configurable using the "WhenPlayerLevel" variable in the config. This data will be stored in a new accountwide_mounts table.

All of the mounts are defined in the "mountSpellIDs" table on Line 22. Feel free to add/remove any to tailor to your server if needed.

This script allows learned pet companions to be shared across all characters on the account. This data will be stored in a new accountwide_pets table.

All of the pets are defined in the "petSpellIDs" table on Line 18. Feel free to add/remove any to tailor to your server if needed.

Not sure if you are just like me and get tired of farming reputations on multiple characters, but this script allows all of the reputation progress to be shared across all of your characters.

There are some exceptions to the rule though. In order to not break factions by inadvertently making reputations fully accountwide, factions will stay true as they do today. Horde factions will only be shared to horde characters. Alliance factions will only be shared to alliance characters. Neutral factions will be shared to both.

This script will synchronize learned flight paths across all characters on your account that are within the same faction.

Due to horde/alliance interactions, horde flight paths will only be shared with other horde characters and alliance flight paths will only be shared with other alliance characters on the same account.

Want to flaunt that hard earned title on all of your characters? This script will synchronize earned character titles to the other characters on your account.