Here is the full list of all 58 Paladins achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Play 250 hours with a player from your friends list in your party.
Have over 30 different champions at mastery level 20 or higher
Earn over 1,000,000 Gold over your play history
Have over 30 different champions at mastery level 15 or higher
Reach Master in Ranked
Have over 30 different champions at mastery level 10 or higher
Play 100 hours with a player from your friends list in your party.
Earn over 500,000 Gold over your play history
400 Double Kills.
10 Champions at Mastery 5.
Shield over 200,000 damage in a match
9 Champions at Mastery 5.
8 Champions at Mastery 5.
Play 100 matches while in a party.
Play over 300 matches
7 Champions at Mastery 5.
200 Double Kills.
Heal over 100,000 health in a match
6 Champions at Mastery 5.
Get a daily reward 7 days in a row
Spend over 100,000 Credits in the item store over all your matches
Play 50 matches while in a party.
5 Champions at Mastery 5.
100 Double Kills
Play 10 hours with a player from your friends list in your party.
Kill an enemy player from over 300 units away.
4 Champions at Mastery 5.
Unlock Ranked
3 Champions at Mastery 5.
Survive more than 50 battles with less than 10% health.
Play 25 hours with a player from your friends list in your party.
50 Double Kills.
Play 20 matches while in a party.
2 Champions at Mastery 5.
Kill an enemy player who is on a 15 killstreak or higher.
Kill more than 20 enemy champions in a single match.
Deal damage to every enemy champion in a match before any of them damage you.
Play 10 matches while in a party.
Reach a 20 kill streak in a match
Play 5 hours with a player from your friends list in your party.
Kill a player with an environmental hazard.
Be the only player alive in a match.
Kill an enemy champion after they had already killed you.
Deal more than 100,000 damage during a match.
Get a killing blow after the round has ended.
10 Double Kills.
Land 5 headshots in a row without missing.
Play a match while in a party.
Reach level 30 during the Paladins Beta.
1 Champion at Mastery 5.
Kill an enemy player while you are at or below 50 Health.
Have a Paladins account over 1 year old
Unlock 100 Cards.
Build your own custom loadout
Die to an environmental hazard.
Win a match where the enemy team scored no points.
Kill a player in the air who is over 100 units above the ground.
Complete the Paladins Tutorial.