Here is the full list of all 31 Blood Bowl 2 achievements.
You made Mutated a player by increasing his level
You have arrived in a competition final
You have lost a player in a match (League or Campaign)
You have won a match in a solo league
You have levelled up as coach
You have trained a team until it has killed 5 opponents (League or Campaign)
You have reached a Fan Factor of 10
You have studied the composition of an opposition team
You pushed 3 opposition players off the pitch in the same match (League or Campaign)
You won a match without conceding a Touchdown (League or Campaign)
You have won the first match of the Campaign
You have hired Cheerleaders for your team
You have created a team
You have faced a coach in a multiplayer league
You have hired a member of staff for a team and purchased an enhancement for its stadium
You mutated a Skaven player with the Horns skill
You have taught an Agility skill to a Dwarf player
You intercepted opponent's Pass (League or Campaign)
You finished a match with an elf team without incurring any injuries (League or Campaign)
You have trained a team to a treasury level of 500,000
You have a team whose value is greater than 1900
You have trained a player to level 7
You have improved a stadium to its maximum level
You have completed the Campaign and saved the Old World
You bought a player in the transfer market
You have bought and fired a player without him even playing a match
You gained an “MVP” mention for a dead player (League or Campaign)
You sold a level 7 player on the transfer market
You have reached the maximum level as coach (20)
You have won a match in a multiplayer league
You have won all the Trophies