I am unable to get the achievement "Reverse Engineering" to work. Killing the Gaia statues (corrupt) with the Gaia Spear does not trigger the achievement.
I have read you have to
- not have the spear
- cut off right arm
- pick up spear
- change weapon to spear
- kill Gaia with said spear
Is it only possible to get this when one does not yet have the Spear? If so I have to restart the game with a new character and play all the way to this point, hoping I don't die after having picked up the spear, just for this one achievement.
I have tried damaging the Gaia with the lowest tier weapon I have, but no matter which, when I proceed to cut of the right arm with the low tier weapon, it kills the Gaia.