July 7th may not feel like a special day to most people, but to olderfans, it's Bungie Day. Bungie Day exists for no other reason than to celebrate the developer's infatuation with the number 7. Even though the developer has moved on to other things and the fate of the franchise now lies with 343 Industries, the day is still celebrated in Halo: The Master Chief Collection where players can make progress towards two date specific achievements.First, you'll want to enter's Valhalla map in Forge mode, in a custom game or in multiplayer matchmaking. Here you can view the Seventh Column Symbol sigil and you can cross off one of the two different sigils needed for the following achievement:Secondly, you'll also want to enter's Zanzibar map in Forge mode, in a custom game or in multiplayer matchmaking. On the beach, there's a sign near the water's edge. Tomorrow it will read "Are you finding Ling-Ling's head?", and you can cross off one of the two different unique signs needed for the following achievement:July is quite a busy time for date specific achievements and there will be several others popping up throughout the month. We'll be sure to remind you about those nearer the time. You can either keep your eyes peeled to TA's front page for those articles, or subscribe to the Achievement Reminders news category to receive PMs or e-mails every time we remind you about impending achievements.We've got the full list of Halo: The Master Chief Collection achievements - check the list for guides to unlocking them.