Halo Wars 2

This achievement will unlock once all twelve missions of the Campaign have been successfully completed on either a Solo or Co-Op Legendary playthrough (mission select is fine, too). As you can imagine, the Legendary difficulty will increase the AI's health and damage output, and they will generally play much more aggressively altogether. One of the best pieces of advice to keep in mind when playing on Legendary is to rely on a strong defense at all times; in our experience, fortifying bases with turrets is key and Hornets are an extremely reliable Unit to build (when possible), as are Snipers and Marines with the "Grenade Throw" upgrade.

If you have collected the various player-strengthening Skulls prior to playing a mission on Legendary, feel free to activate them in the pre-mission lobby as to make things easier for yourself. The best Skulls to use on a Legendary playthrough are:

• Pain Train
• Bountiful Harvest
• Emperor
• Total Annihilation
• Firestarter
• Things That Go Boom
• Sugar Cookies

Overall, completing the entire Campaign on Legendary won’t be an easy task, but the ability to use Skulls to strengthen your Units and gameplay should be a significant help in making an otherwise difficult feat more manageable. Make sure you are utilizing the manual save function as often as possible, too; when you get past a tricky section of a mission, make a save as to avoid having to replay some of the mission if things go wrong.

Once all the twelve missions have been completed on the Legendary difficulty setting, this achievement will be yours.