CheatCodes.com has the complete list of all Undertow Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Undertow as of Wednesday September 2, 2015 are shown below, or you can print out our Printable Achievements Checklist that shows all Undertow Achievements and Gamerscores in a simple quick-reference format.
Complete the Hope of Humanity Campaign
Complete the Nemo's Wrath Campaign
Complete the Atlantis Rising Campaign
Complete each chapter in co-op mode
Take over 100 control points
Complete each chapter on Ultra
Upgrade all units to level 3 in a single ranked match
Get 100 kills. Unlocks a Gamer Picture!
Win a ranked Conquest match by taking all of the control points (get a shutout)
Get 200 depth charge kills
Upgrade all units, all races to level 3
Get 10,000 kills. Unlocks a Gamer Picture!