Probably the biggest update yet!

New: added 9 new achievement categories (PetMasterGive, PetMasterReceive, DistanceLlama, ItemPickups, Smelting, Treasures, PlayerCommands, LavaBuckets, WaterBuckets)!
New: added support for PetMaster 1.3+ for two of the new achievement categories.
New: added total number of achievements in each category on the main /aach list GUI!
New: implemented optional enriched statistics in the /aach list GUIs for each category!
New: implemented optional cooldown with fancy action bar message for LavaBuckets, WaterBuckets, Beds, Brewing, MusicDiscs categories!

Improvement: rebuilt some entire parts of the plugin and performed a major code overhaul. The project is now easier to maintain and more welcoming to new contributors!
Improvement: enhanced configuration file handling, now less prone to failures.
Improvement: reduced plugin load time.
Improvement: increased the overall performance of the plugin.
Improvement: enhanced some log messages.
Improvement: improved support for Minecraft 1.11.

Fix: blocked some possible abuses in Trades, AnvilsUsed and Brewing categories.
Fix: handled some cases where the statistics for a given action were not counted correctly.
Fix: a ton of other minor fixes which should make the plugin overall more stable.

Security: implemented stronger protections against database injection attacks.

Other: new Vietnamese translation available.

Major update!

New: brand new GUI system for the /aach list command!
New: /aach week and /aach month commands to get weekly and monthly rankings!
New: PostgreSQL now supported as a database system.
New: option to add a prefix to database tables!
New: DisplayName and Goal parameters for achievements. Visit the FAQ for more information. (implemented by alchemistmatt from the AddStar server, thanks!)
New: ObfuscateProgressiveAchievements option to obfuscate all but next achievement. (implemented by alchemistmatt from the AddStar server, thanks!)
New: SilkTouch option to ignore blocks broken with Silk Touch in Breaks achievements.
New: easter egg!

Improvement: books can now store more pages and are sorted by chronological (or reverse) order!
Improvement: cleaner and more interactive help command!
Improvement: permissions implemented for all the commands.
Improvement: small performance improvements.
Improvement: better code readability and more comments. Some extra logging information. (help from alchemistmatt from the AddStar server, thanks!)
Improvement: more comprehensive wiki.

Fix: fixed errors showing in the console when using MySQL.
Fix: multiple other fixes.

3 new achievement types and many other improvements!

New: 3 new achievement categories can now be used to create achievements: ender pearls, jukeboxes and distances with elytra!

Improvement: completely redesigned the internal management of the configuration files: more efficient and more maintainable!
Improvement: improvements to default configuration file.

Fix: fixed a bug that would sometimes incorrectly update distances when going through a nether portal.
Fix: fixed some minor issues with the colours of the plugin's messages.

Other: many other improvements and fixes.

Support for Spigot 1.9 and more!

New: added support for item metadata in break, place and craft achievements (thanks to CryLegend for his contribution)! See default config (log_2:1) for syntax example.
Improvement: added support for Minecraft 1.9! If you are using older versions of Minecraft, don't worry, this version is compatible with them, please update! If you find a bug with Minecraft 1.9, please open a report on the issue tracker.
Improvement: yet again heavy work on performance.
Fix: fixed maximum level achievements that were not tracking levels accurately.
Other: various other improvements and fixes.