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The Longest Day
Complete all of the pet battle daily quests listed below.
The Longest Day is a 10-point achievement that rewards a 
Marked Flawless Battle Stone for completing all required pet battle daily quests across Kalimdor, Eastern Kingdoms, Outland, Northrend, Cataclysm zones, Pandaria, and the Beasts of Fable quest line.
Note: No Single-Day Requirement
As of Patch 6.1, this achievement no longer requires completing all quests within a single day, so you can spread the battles across multiple daily resets.
Pre-Complete Beasts of Fable
Defeat the Beasts of Fable first and hold the completed quests in your log before your final push, as all three quests can be turned in at one location and represent the most time-consuming portion of the achievement.
Complete Kalimdor Dailies
Defeat the following trainers across Kalimdor: Grand Master Trixxy at 65.6, 64.6 in Winterspring; Grand Master Obalis at 56.6, 41.8 in Uldum; Brok at 61.4, 32.8 in Mount Hyjal; Zunta at 43.8, 28.8 in Durotar; Dagra the Fierce at 58.6, 53 in Northern Barrens; Merda Stronghoof at 57.2, 45.8 in Desolace; Zonya the Sadist at 59.6, 71.6 in Stonetalon Mountains; Cassandra Kaboom at 39.6, 79.2 in Southern Barrens; Kela Grimtotem at 31.8, 32.8 in Thousand Needles; Zoltan at 40, 56.6 in Felwood; Traitor Gluk at 59.6, 49.6 in Feralas; Elena Flutterfly at 46, 60.6 in Moonglade; Analynn at 20.2, 29.6 in Ashenvale; and Grazzle the Great at 53.8, 74.8 in Theramore's Fall.
Complete Eastern Kingdoms Dailies
Defeat the following trainers across Eastern Kingdoms: Julia Stevens at 41.6, 83.6 in Elwynn Forest; Old MacDonald at 60.8, 18.6 in Westfall; Bill Buckler at 51.2, 73.6 in The Cape of Stranglethorn; David Kosse at 62.99, 54.57 in The Hinterlands; Deiza Plaguehorn at 67, 52.4 in Eastern Plaguelands; Kortas Darkhammer at 35.6, 27.8 in Searing Gorge; Everessa at 76.6, 41.6 in Swamp of Sorrows; Durin Darkhammer at 25.6, 47.6 in Burning Steppes; and Grand Master Lydia Accoste at 40.2, 76.6 in Deadwind Pass.
Manage Your Quest Log
Because the quest log cap is 25 quests, clear out at least 20 slots before collecting and holding completed dailies, keeping in mind that the Beasts of Fable quests alone account for three of those slots.
Tips
At roughly 6 minutes per battle including travel, completing all 41 required quests in one session takes close to 4 hours — defeat and hold completed Beasts of Fable quests in your log ahead of time to save close to an hour on the day you turn everything in.
See the video guide for a full walkthrough of the route and battles.