Achievements

Achievements are a good way to earn gems and discs/shards just by playing the game normally. Unlike missions, all achievements progress at the same time, so there isn't really a need to be conscious about doing specific things to unlock an achievement. Just play normally, and the rewards will roll in.
Note that the full list of achievements are hidden. The ones displayed are the ones closest to completion. For example, you need to clear "Reach Player Level 5" achievement before the "Reach Player Level 10" achievement is shown (it will start at level 5).
==Categories==
The achievements generally fall into these categories:
*Player account level up
*Spending gold
*Champions
**Summoning champions
**Training champions
**Reaching certain champion levels
**Ascending champions
*Gear
**Equipping gear sets
**Upgrading gear
*Adventures
**Completing scenarios
**Completing boards
**Progressing in boss raids
*Arena
**Defeating challengers
**Defeating arena opponents
Notice that the bolded ones are daily quests too. Clearing your missions every day gets you more rewards than you think!
==Steam Achievements==
The achievements in Steam are largely similar to the ones in game, with some minor differences. Examples include Fire Bull Demon King achievements completing at different levels, there is no player level 40 achievement in Steam, etc.
Here is the full list of Steam Achievements, which can give you some hints about which achievements you haven't yet unlocked in the game: