Here is the full list of all 43 Razenroth achievements.
Kill Ro'gnar
Find Phoenix altar
Unlock Fire elemental
Kill Evil Tree
Destroy 100 environment elements
Kill 100 monsters
Destroy 50 environment elements
Kill Meat Monster
Kill Mud Monster
Kill Wind Titan
Kill Flameclaw
Kill Goblin Sapper
Kill Swamp Thing
Kill Shaman
Complete the game on any difficulty
Complete the game on hard difficulty level
Complete the game on hell difficulty level
Kill 500 monsters
Kill 1000 monsters
Kill 5 mini bosses
Kill 20 mini bosses
Buy new thing for the hut
Buy all available things for the hut
Drink 50 potions
Complete 5 quests
Find magic apple
Buy 1 item
Unlock Skeletor
Unlock grandpa
Unlock golem
Unlock Treant
Destroy 500 environment elements
Collect 200 pieces of gold
Collect 500 pieces of gold
Collect 1000 pieces of gold
Open 5 chests
Open 15 chests
Open 30 chests
Buy 20 items
Buy 50 items
Kill Gruu
Kill Killer Plant
Kill Spectre