Here is the full list of all 49 Radio Commander achievements.
Finished a mission delivering orders only with your voice
Finished a mission without using time compression
Have a squad lose track of their position
Eliminated at least 150 enemies with air support
Eliminated at least 200 enemies with helicopters
Asked a unit its position 20 times during a single mission
Ordered a retreat at elast 3 times in one mission
Medevaced at least 100 wounded
Renamed 50 tokens
Ordered an air strike on a restricted area
Finished the Campaign
Finished the Campaign on Veteran Mode
Campaign mission 9 completed
Campaign mission 9 completed on Veteran Mode
Found Echo before sunrise
Campaign mission 8 completed
Campaign mission 8 completed on Veteran Mode
Enabled the artillery to reach farther targets
Campaign mission 7 completed
Campaign mission 7 completed on Veteran Mode
Sometimes there's just nothing you can do
Failed a mission
Ordered a friendly-fire airstrike
Hit both a friendly and enemy unit with a single air strike
Didn't let the enemy forces face your units with superior numbers in mission 6
Campaign mission 6 completed
Campaign mission 6 completed on Veteran Mode
Mission 5 completed under 10 in-game hours
Campaign mission 5 completed
Campaign mission 5 completed on Veteran Mode
Flanked at least 3 enemy units during a single mission
Rescued as many POWs as you possibly could in mission 4
Allowed a squad to run out of ammo on the battlefield
Campaign mission 4 completed
Campaign mission 4 completed on Veteran Mode
Campaign mission 3 completed
Campaign mission 3 completed on Veteran Mode
Completed mission 3 without using any kind of air support
Admired the base for 5 minutes total
Mission 2 completed without having your soldiers wounded or KIA
Issued orders to at least 3 units within 1 minute
Killed at least 300 enemy soldiers
Didn't communicate anything for 3 in-game hours
Mission 1 completed under 3 minutes
Campaign mission 2 completed
Campaign mission 2 completed on Veteran Mode
Called down artillery fire dangerously close to friendly positions
Campaign mission 1 completed on Veteran Mode
Campaign mission 1 completed