4 Elements HD
16 Achievements
PS3
Cornerstone
Buy any castle upgrade
58.6%
How to unlock the Cornerstone achievement in 4 Elements HD - Definitive Guide
EdEN
Story Related, Can't be missed. The game shows you how to buy a castle upgrade, and you must do so to progress.
KIRrh
stratege.ru
stratege.ru
This guide was translated automatically.
The description speaks for itself, buy any improvement and the trophy is yours)