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