Easy "Power to the City" Achievement
Midway through the level you will find two rotating sections of platforms (A and B) to sides 1, 2, or 3. To clear each platform, you'll need to charge up a Pylon with a Charge Cube on each of the platforms for each of the numbered sides (Line up platform A and platform B with the same number. Rotate them to the new numbered sides and match them.). When you charge up the correct station you will see a short cut scence of a light turning green or a gate opening (depending on which platform and side it is). If you are not sure that you have done a side, go back to the tower and check the section control station. Completed sections are green, uncompleted sections are red. Once you cleared all 3 sections of both platforms the secret area and achievement will unlock.
Echoes of WALL-E
LV1: Near the start of the secret area, find it on a dumpster.
LV3: After throwing the cubes in the bucket to lower the platform, cross the new platform and shoot the trash to the left. Grab the vial in the trash and use it on a vending machine nearby. Carry 3 cubes up the ramp to the left, throw the cubes in the pail. Lastly, follow the new platform down to find the Echo.
LV4: In the long winding path with several scattered volatile barrels, find a Pylon that can be charged to activate a wall right next to same Pylon. Find the suitcase at the top.
LV5: After opening the first door, enter it and go left. There is a lift at back of the next room. Ride the lift up until in reaches the top. Go right a little bit to find the suitcase.
LV7: There will be a split in the road near the hill. The Echo is located on the right side of this split.
LV8: When the humans are falling, power up the Vending Station and use charge cubes to activate the two power Pylons. The radio will be turned off to the right. Follow the newly raised path.
EVE Suitcases
LV2: Head back to the starting point after doing the activities.
LV3: After you open the garage door by throwing cubes into the bucket, look carefully at every corner of the building. The suitcase can be easily missed since its hidden in one of those corners.
LV6: Find it directly behind you at the start of the trash collecting mission
LV8: Opposite Special Object 8.
Axiom Secret Area level...