Here is the full list of all 50 Rugby Challenge 3 achievements.
Win 10 matches, each as a different team
Win the cup for every tournament in the international Seven-A-Side Series
Complete Coach Career Mode
Win the French Division 2 Competition
In Fifteens Pro Career Mode, accept a contract from a team in a lower competition tier
Rate 100 custom players or teams
Score 4 consecutive tries in a match with Jonah Lomu vs England
Break through a full back with Jonah Lomu
Complete Pro Career Mode
Complete a Fifteens Pro Career Mode while sticking with your starting club
Win the Elite 12 Competition
Win the French Division 1 Competition
Win the ITM Cup Competition
Win the Buildcorp National Rugby Championship
Win the AVIVA Premiership Competition
Watch through the credits
Win the Super Rugby Competition
Win the Quad Nations Compeition
Win the World Championship Competition without losing or drawing a match
Intercept a pass and score with that player
Win a match while 2 players have been sent off
Score a drop goal with a prop or hooker
Successfully hire a player rated 80 or higher for your club in coach career mode
Make a try-scoring run which starts within your own in-goal area
Complete an online match
Grubber kick the ball between the goalposts during a match
Get gold medals in every tutorial
Score a conversion on pro difficulty
Use the "send runner" strategy to gain more than 5 metres past the ruck
In Fifteens Pro Career Mode, accept a contract from a team in a higher competition tier
In Fifteens Pro Career Mode, get selected and play for international duty
Create and save a custom player with a tattoo on every limb
Score a penalty, conversion or drop goal which bounces in off the goalpost or crossbar
Create and save a custom player
Maintain over 80% possession in a match
Download a custom player or team
Get promoted to team captain
Share a custom player or team
Win 60% of lineouts in a match that aren't thrown by your team
The ref calls a yellow or red card against you
Become the goal or play kicker for your team
Score a try in a Sevens match within the first minute on the game clock
Maintain over 80% territory in a match
Score a try in a Fifteens match within the first five minutes on the game clock
Use a number eight pickup in a Fifteens match
Complete all goals in a single Pro Career match
Create and save a pro player
Do not concede any penalties in a match
Successfully steal the ball at a breakdown before the ruck forms
Use a shortened lineout in a Fifteens match