Here is the full list of all 24 Rugby Challenge achievements.
The ref calls one red card against you
Win a match with 2 players sent off
Win the Top 14 Competition
Win the Quad Nations Competition
Make a try-scoring run which starts within your own in-goal area
Win 10 matches, each as a different team
Watch through the credits
Win the Rugby 15 Competition
Score 4 consecutive tries with Jonah Lomu vs England
Win the World Championship Competition without losing or drawing a match
Win the ITM Cup Competition
Create and save a custom player
Win 60% of lineouts in a match that aren't thrown by your team
Break through a full back with Jonah Lomu
Score a conversion on pro difficulty
Get gold medals in every tutorial
Maintain over 60% territory in a match
Do not concede more than 2 penalties in a single match
Maintain Over 60% possession in a match
Complete 25 online matches
Complete 50 online matches
Complete Career Mode
Unlock 'Team Lomu'
Collect $100,000 Rugby Dollars