Fallout 76
72 Achievements
1,580
171-215h
A Real Challenger
Complete 20 Challenges
20
39.01%
How to unlock the A Real Challenger achievement in Fallout 76 - Definitive Guide
Examples are:
Reach level 4,6,8
Equip a perk card
Collect a bobble head, holotape or magazine
Collect wood
Harvest plants
Scrap junk
Deploy a C.A.M.P
Cook a meal
Boil water
Acquire a disease
Kill a creature
Kill an enemy
Repair a piece of armour or weapon
Destroy a robot
As mentioned in there, many of the challenges will be knocked out on your journey for doing the simplistic of activites repetitively. The only concern that should come up is if you've reached, say, Level 100 and still haven't received either of these two trophies.
There are hundreds of challenges to do in the game, and you will likely get your 20th completed within less than an hour of your adventure. These range from killing enemies to collecting caps to time spent in the game. Simply play the game and you will get this without issue.
Challenges range from killing types of enemies, to finding locations, to hacking terminals etc. Many of them are tied to trophies and I'd recommend using the "tracking" system in-game to help you see how far off you are on certain things.
To access challenges go into the start menu and choose "challenges." From here you'll find a huge list of them organized by type that you can go for. You'll very easily complete 20 early on.
You receive atoms for completing challenges and can use these atoms in the online store for weapon and armor skins, C.A.M.P. items and etc.