It seems that we already have steam-achievements and live-achievements as synonyms for achievements, but there are 21 questions tagged trophies. Since we have the Xbox's and PC's achievements merged, we should probably merge the PS3's as well.
I think this should be reconsidered.
They're not called achievements for PlayStation 3: they're called trophies. When someone is searching for info and they're a PS3 player, they search for trophies, which we will no longer rank on because of this change unless someone has the foresight to add the word trophy in the body (thus defeating the purpose of the tag synonym in the first place).
For example, the only reason we rank on certain Dungeon Siege III trophies in Google is because "trophies" is still indexed:
The trophy for Worthy of Legend reads: You completed Dungeon Siege III at the ... Browse other questions tagged achievements trophies dungeon-siege-3 or ask ...
Royalist Ally - You have shown unwavering support to the Crown. It seems odd to have two trophies for the same thing. ... Browse other questions tagged ps3 spoiler achievements dungeon-siege-3 or ask your own question. ...
In Dungeon Siege III, the trophy/achievement I Could Do This Blindfolded reads: You defeated a major opponent using only your default equipment. ...
Put another way, if we have to mention both achievements and trophies in order to rank for the two main audiences for a particular console game, they're not really synonyms in the classical sense. I don't know what we're serving by combining the two into one.
Yes, it kinda sucks for tagging that Sony decided to be a special little flower and call their system trophies, but we should only be using the tagging system for descriptive organization, not normative.