Grab the Elder Signs achievement in Halo: The Master Chief Collection this Earth Day By Sean Carey, 20 Apr 2020 CommentsApril 22nd marks Earth Day; an event celebrated around the world to drum up support for environmental protection. Halo also marks the occasion by making one of the sigils needed to obtain the Elder Signs achievement in Halo: The Master Chief Collection viewable. To unlock this achievement, you need to find and view two different sigils on the Halo 3 map, Valhalla. These sigils only appear on certain days of the year and are located on the far wall behind the turret. On April 22nd, a skull with a recycling sign will be visible. The last time you could have viewed one of these special signs was on January 1st, so hopefully, you only need one more to grab this achievement. Yazite's guide details that you can do this in Forge, custom games or even in online matchmaking. The Elder Signs achievement in Halo: The Master Chief Collection worth 43 pointsHalo 3: View 2 different sigils on Valhalla.The Elder Signs achievement in Halo: The Master Chief Collection (CN) worth 32 pointsHalo 3: View 2 different sigils on Valhalla.The dates and the sigils that can be found are listed below: January 1st (New Year's Day): Make Love Not WarApril 22nd (Earth Day): A skull with a recycling signMay 5th (Cinco De Mayo): Toady Was Live!July 4th (Independence Day): BBQ at Bob's Place (this is a reference to Marathon in which you kill BOBs or BOB-B-Qing)July 7th (Bungie Day): Seventh Column SymbolOctober 31st (Halloween): A gravestone that has the initials "R.I.P."November 11th (Veteran's Day): Kilroy Was HereDecember 25th (Christmas): A Christmas light with an X on itOnly 5% of tracked gamers (16,165) have unlocked the time-specific achievement, so there are plenty more of you who still need to grab this one. The next time you can view a sigil is on May 5th for Cinco De Mayo. Make sure you subscribe to the Achievement Reminder news category where you'll be sent a PM every time we make a post about achievements that become obtainable. We will republish this story on the day as a further reminder.Achievement ReminderXbox One Written by Sean CareySean joined the team as a Staff Writer for both TrueAchievements and TrueTrophies in 2019. He games across all platforms and is always looking for an excuse to replay any of the Metal Gear Solid titles.