Why be limited by what defines a trophy achievement in other games? As long as a trophy represents the difficulty of the achievement.
Still A, B, C = gold, silver, bronze is fine too.
Certain in-game achievements aren't recorded by the game so couldn't form part of an unofficial trophy list. So 8 team attacks in a mission wouldn't work. But killing enemy aces, leaders and tanks is recorded on the mission stats so can be a trophy. Getting weapon upgrades and achieving certain levels for units is another trophy thing. Like what trophy for getting all units to elite? Bronze? seems pretty easy to do.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
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