Here is the full list of all 24 Jonah Lomu Rugby Challenge achievements worth 1,000 gamerscore.
Complete Career Mode
Win the Top 14 Competition
Win the Quad Nations Competition
Win the ITM Cup Competition
Win the Rugby 15 Competition
Unlock 'Team Lomu'
Collect $100,000 Rugby Dollars
Watch through the credits
Score 4 consecutive tries with Jonah Lomu vs England
Win a match with 2 players sent off
The ref calls one red card against you
Break through a full back with Jonah Lomu
Score a conversion on pro difficulty
Complete 50 online matches
Complete 25 online matches
Win 10 matches, each as a different team
Make a try-scoring run which starts within your own in-goal area
Create and save a custom player
Win the World Championship Competition without losing or drawing a match
Win 60% of lineouts in a match that aren't thrown by your team
Maintain over 60% territory in a match
Maintain Over 60% possession in a match
Do not concede more than 2 penalties in a single match
Get gold medals in every tutorial