Here is the full list of all 14 Ironcast achievements worth 1,000 gamerscore.
Complete a Battle mission at mission 3 or later without taking any damage
Create a match chain with 4 different types of node
Equip a passive augmentation in all available slots in a single campaign
Win a Battle with less than 5% health left
Upgrade an Ironcast to over 1,250 HP in a single campaign
Match 20 or more nodes in a single chain
Win a Battle mission at mission 3 or later without using any defences
Your Ironcast has been destroyed by overheating damage
Kill 3 Enemies in one mission
Purchase a new Ironcast or Commander using Commendation tokens.
Keep both Shields and Drives active for 5 turns
Obtain 100 Commendation tokens
Defeat Commandant René Durant
Defeat the final threat facing Britain