best AMU for loki is valkyrie with excalibur, try dodging to corners until overdrive is ready and during overdrive get 200k damage and get hit and do another 200k and then again get hit and second overdrive is ready and by the second overdrive loki will almost be dying and u got the achievement and try getting both achievement weapons and only use excalibur
well hard badge is quite easy its just some random endurance badge as every weapon gets last upgrade and all perks and i would like to recommend not to use any cheatcode as its irreversible, and use big kaiser or anti freezer against agents?
tip for last icedale and crimson horde stage: for crimson horde, use worms on enemy tower first and every building need 2 worms to bring down with full upgrade build 3 obelisk on bottom and build 3 farm on top and when u got 3 archer and 1 warrior and 1 assassin take middle castle and keep on using worms on enemy castles with no unit in it will finish in around 4 minutes or bit over it: for icedale get all upgrade and take giant out and get 4 make and send 2 mages per castle and just make it urs not full take it and keep on pushing, last stage actually only need 5 mage to finish but u need to use magic and be mindful with ur mana as it lowly regenerates but mages are op unit and so u wont have hard time