Here is the full list of all 31 Reforged TD - there are Tower Defense achievements.
Use 100 Abilities
Build 100 Tower
Reach Playerlevel 5
Build 10 Tower
Use 10 Abilities
Win a game.
Build a tower.
Causing 10000 fire damage with towers.
Win 10 games
Win 100 games
Win 1000 games
Win 10000 games
Build 1000 Tower
Build 10000 Tower
Who knows how to unlock this achievement.
Use 1000 Abilities
Use 10000 Abilities
Reach Playerlevel 10
Reach Playerlevel 15
Reach Playerlevel 20
Reach Playerlevel 25
Reach Playerlevel 30
Reach Playerlevel 35
Reach Playerlevel 40
Reach Playerlevel 45
Reach Playerlevel 50
Reach stage 3 in challenger mode
Reach stage 5 in challenger mode
Reach stage 8 in challenger mode
Reach stage 12 in challenger mode
Reach stage 16 in challenger mode