Easy Max Imbued gear
Forge a piece of gear without imbuing anything into it, then, go to upgrade it, put as many minions into it as you want and as soon as the animation starts but before any minions jump into the smelter, hit start to pause the game and exit, when you come back, the minions will have been imbued, but won't have been taken from your supply. Makes it real easy to get the Ultimate gear achievements.